Minggu, 06 September 2009

PlayStation 3

PlayStation 3

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PlayStation 3
PlayStation 3 logo


(Counter-clockwise from top) Original logo, new logo, original model, controller, newer slim model design.
Manufacturer Sony EMCS, Foxconn, ASUSTeK and Logitech for SCEI[1]
Product family PlayStation
Type Video game console
Generation Seventh generation era
Retail availability November 11, 2006
Units sold 24.6 million (as of August 5, 2009)[2] (see below)
Media Blu-ray Disc, DVD, CD (all models)
Super Audio CD (20 GB, 60 GB, 80 GB [CECHExx models]), Digital distribution
Operating system XrossMediaBar
system software version 3.00[3]
CPU 3.2 GHz Cell Broadband Engine with 1 PPE & 7 SPEs
Storage capacity 2.5" SATA hard drive
(20 GB, 40 GB, 60 GB, 80 GB, 120 GB, or 160 GB included) (upgradeable)
Graphics 550 MHz NVIDIA/SCEI RSX 'Reality Synthesizer'
Controller input Sixaxis, DualShock 3
Connectivity
Online services PlayStation Network
Backward
compatibility
PlayStation (all models)
PlayStation 2 (20 GB, 60 GB, and CECHExx 80 GB models)
Predecessor PlayStation 2

The PlayStation 3 (marketed as PLAYSTATION 3[4] until September 2009[5] and officially abbreviated to PS3) is the third home video game console produced by Sony Computer Entertainment, and the successor to the PlayStation 2 as part of the PlayStation series. The PlayStation 3 competes with Microsoft's Xbox 360 and Nintendo's Wii as part of the seventh generation of video game consoles.

A major feature that distinguishes the PlayStation 3 from its predecessors is its unified online gaming service, the PlayStation Network,[6] which contrasts with Sony's former policy of relying on video game developers for online play.[7] Other major features of the console include its robust multimedia capabilities,[8] connectivity with the PlayStation Portable,[9] and its use of a high-definition optical disc format, Blu-ray Disc, as its primary storage medium.[10] The PS3 was also the first Blu-ray 2.0-compliant Blu-ray player on the market.[11]

The PlayStation 3 was first released on November 11, 2006 in Japan,[12] November 17, 2006 in North America and South America,[13] and March 23, 2007 in Europe and Oceania.[14][15] Two SKUs were available at launch: a basic model with a 20 GB hard drive (HDD), and a premium model with a 60 GB hard drive and several additional features[16] (the 20 GB model was not released in Europe or Oceania).[17] Since then, several revisions have been made to the console's available models.[18]

Contents

[hide]

History

Sony officially unveiled the PlayStation 3 to the public on May 16, 2005, during the E3 2005 conference.[19] A functional version of the system was not present there,[20] nor at the Tokyo Game Show in September 2005,[21] although demonstrations (such as Metal Gear Solid 4: Guns of the Patriots[20]) were held at both events on devkits and comparable PC hardware.[20][21] Video footage based on the predicted PlayStation 3 specifications was also shown (notably a Final Fantasy VII tech demo).[22] The initial prototype shown in May 2005 featured two HDMI ports, three Ethernet ports and six USB ports;[23] however, when the system was shown again a year later at E3 2006, these were reduced to one HDMI port, one ethernet port and four USB ports, presumably to cut costs.[16][24] Two hardware configurations were also announced for the console: a 20 GB model and a 60 GB model, priced at $499 (€499) and $599 (€599), respectively.[16] The 60 GB model would be the only configuration to feature an HDMI port, Wi-Fi internet, flash card readers and a chrome trim with the logo in silver.[16] Both models were announced for a simultaneous worldwide release: November 11 for Japan, and November 17 for North America and Europe.[25]

Silver PlayStation 3 prototype (E3 2005 specs). Note the two additional USB ports, three gigabit ethernet ports and two HDMI ports.

On September 6, 2006, Sony announced that the PAL region (Europe and Oceania) PlayStation 3 launch would be delayed until March 2007, due to a shortage of materials used in the Blu-ray Disc drive.[26]

At the Tokyo Game Show on September 22, 2006, Sony announced that it would include an HDMI port on the 20 GB system, but a chrome trim, flash card readers, silver logo, and Wi-Fi would not be included.[27] Also, the launch price of the Japanese 20 GB model was reduced by over 20%,[28] and the 60 GB model was announced for an open pricing scheme in Japan.[28] During the event, Sony showed 27 playable PS3 games running on final hardware.[29]

Launch

The PlayStation 3 was first released in Japan on November 11, 2006 at 07:00.[12] According to Media Create, 81,639 PS3 systems were sold within 24 hours of its introduction in Japan.[30]

Soon after its release in Japan, the PS3 was released in North America on November 17, 2006.[13] Reports of violence surrounding the release of the PS3 include a customer shot,[31] campers robbed at gunpoint,[32] customers shot in a drive-by shooting with BB guns,[33] and 60 campers fighting over 10 systems.[34]

The console was originally planned for a global release through November, but the European and rest-of-the-world's release was delayed "until March" at the start of September.[35] With it being a somewhat last-minute delay, some companies had taken deposit-based pre-orders, to which Sony informed customers that they were eligible for full refunds or could continue the pre-order.[36] On January 24, 2007, Sony announced that the PlayStation 3 would go on sale on March 23, 2007 in Europe, Australia, the Middle East, Africa and New Zealand.[14][15] The system sold about 600,000 units in its first two days.[37] On March 7, 2007, the 60 GB PlayStation 3 launched in Singapore with a price of S$799.[38] The console was launched in South Korea on June 16, 2007 in a single version equipped with an 80 GB hard drive and IPTV.[39]

Models

Original model

The original PlayStation 3.

There are five PlayStation 3 hardware models, which are commonly referred to by the size of their included hard disk drive: "20", "40", "60", "80" and "160" GB. [16][40] The only difference in the appearance of the first five models was the color of the trim. All retail packages include one or two Sixaxis controllers and/or a DualShock 3 controller (beginning June 12, 2008[41][42]), one miniUSB to USB cable (for connecting the controller to the system), one composite video/stereo audio output cable, one ethernet cable (20, 60, and CECHExx 80 GB only) and one power cable.[40][43][44] All models support software emulation of the original PlayStation,[45][46] but support for PlayStation 2 backwards compatibility has continually diminished with later models.[47] Compatibility issues with games for both systems are detailed in a public database hosted by the manufacturer.[48] All models, excluding the 20GB model, include 802.11 b/g Wi-Fi. In addition to all of the features of the 20 GB model, the 60 GB model has internal IEEE 802.11 b/g Wi-Fi, multiple flash card readers (SD/MultiMedia Card, CompactFlash Type I/Type II, Microdrive,[49] Memory Stick/PRO/Duo), and a chrome colored trim.[50] In terms of hardware, the 80 GB model released in South Korea is identical to the 60 GB model released in the PAL regions, except for the difference in hard drive size.[51]

Like the South Korean and European models, the North American 80 GB model also excludes the PlayStation 2 "Emotion Engine" CPU chip.[47] However, it still keeps the "Graphics Synthesizer" GPU.[52] Due to the elimination of the "Emotion Engine", the level of compatibility was reduced.[47] The 40 GB, 80 GB (2008), and 160 GB models have two USB ports instead of the four USB ports on other models, and do not include multiple flash card readers, SACD support [53], or any backwards compatibility with PlayStation 2 games.[18][47] This was due to the removal of "Graphics Synthesizer" GPU, which stripped the units of all PlayStation 2 based hardware.[54][55]

No official Wi-Fi or flash memory card readers have yet been released by Sony for the 20 GB system, although plans for such add-ons are in place.[56] As of September 2009 Sony have placed no further emphasis on these proposed add-ons.[citation needed] Nevertheless, as the model features four USB 2.0 ports, wireless networking and flash memory card support can already be obtained through the use of widely available external USB adapters.[47]

It was rumored that the Cell processors in the third-generation PS3s (40 GB) would move from a 90 nm process to the newer 65 nm process,[57] which SCEI CEO Kaz Hirai later confirmed,[58] and later to 45 nm. This change lowers the power consumption of the console and makes it less expensive to produce.[59]

Slim model

The redesigned slim PlayStation 3.

Following speculation that a 'slim' model was in the pipeline Sony officially announced the PS3 CECH-2000 on August 18, 2009 at the Sony Gamescom press conference.[60][61] The PS3 slim (officially called the PS3 CECH-2000) features an upgradeable 120GB hard drive and is 33% smaller, 36% lighter, and consumes 34% less power than previous models.[60][62][63] The cooling system has been redesigned and Cell processor has moved to a 45nm manufacturing process.[64]

The PS3 slim also includes support for BRAVIA Sync allowing control of the console over HDMI and runs quieter than previous models but no longer has the ability to install third party operating systems such as Linux.[60][62] The PS3 slim is priced at $299 United States/€299 European Union/£249 United Kingdom/AU$499 Australia/NZ$629 New Zealand/MXN$3,999 Mexico/ P 10,000 Russia/¥29980 Japan and was officially released on September 1, 2009 in North America and Europe and on September 3, 2009 in Japan, Australia and New Zealand.[65][60][62][66] However, some retailers such as Amazon.com, Best Buy, and GameStop started to sell the PS3 slim on August 25, 2009.[67][68] FCC filings also reveal a second slim model, the 250GB CECH-2000B.[69]

Senin, 31 Agustus 2009

Fungsi Hard Disk

Manajemen Hard Disk di Linux - Partisi Hard Disk dengan Parted Print E-mail
Thursday, 27 April 2006
Mengatur partisi dengan baik adalah salah satu cara mengoptimalkan pemakaian hard disk. Menghapus, membuat, mengubah ukuran, dan memberi label partisi kini juga dapat Anda lakukan dalam sistem Linux. Semuanya dengan mengandalkan tool gratis dan open source!

Mengatur partisi dengan baik adalah salah satu cara mengoptimalkan pemakaian hard disk. Menghapus, membuat, mengubah ukuran, dan memberi label partisi kini juga dapat Anda lakukan dalam sistem Linux. Semuanya dengan mengandalkan tool gratis dan open source!

Image

Anda tentu tidak asing dengan istilah partisi maupun tabel partisi. Dua entitas inilah yang mendefinisikan ‘ruangan’ pada hard disk. Bagi Anda yang tergolong pengguna PC awam atau tidak terlalu paham mengenai partisi, suatu hard disk dapat dianalogikan seperti sebidang tanah kosong. Sebelum dapat dipakai, tanah tersebut harus dibagi dalam petak-petak kecil terlebih dahulu. Petak inilah yang diibaratkan seperti partisi. Adapun tabel partisi diandaikan papan keterangan di depan area tanah yang menjelaskan berapa petak yang di dalam area tanah dan berapa luas masing-masing petak. Di dalam petak ini nantinya “ditanami” data, yang dalam wujudnya sehari-hari dapat dilihat sebagai file.

Sebelum dapat ditanami, petak-petak tersebut harus diolah terlebih dahulu. Proses pengolahan inilah yang dikenal sebagai proses format hard disk. Saat melakukan format, Anda dapat memilih berbagai format sistem file (file system). Apabila di Windows, tersedia format FAT atau NTFS. Di Linux, dikenal beberapa sistem file, diantaranya yang cukup populer adalah sistem file ext2 dan ext3.

Sebelum mulai mengutak-atik partisi sistem Linux, sekilas akan dijelaskan bagaimana sistem Linux mendeteksi hard disk Anda. Hard disk biasanya diakses lewat perantaraan file dibawah direktori /dev dan namanya diawali dengan string hd. Lebih jelasnya, hard disk Anda akan dipetakan seperti daftar berikut ini.

Primary IDE master /dev/hda
Primary IDE slave /dev/hdb
Secondary IDE master /dev/hdc
Secondary IDE slave /dev/hdd

Untuk penomoran partisi, Linux menggunakan skema seperti berikut ini.
Partisi primary pertama sampai keempat
/dev/hd*1 - /dev/hd*4
Partisi logical pertama sampai keempat
/dev/hd*5 - /dev/hd*8


Tanda (*) merupakan pengganti huruf ‘a’ sampai dengan ‘z’, misalnya hda, hdb, hdc, dan seterusnya.

Pada praktek Linux kali ini akan digunakan tool berbasis command line bernama parted. Tool ini digunakan untuk mengelola partisi hard disk, dengan fungsi-fungsi antara lain seperti berikut ini.

  • Menambah dan menghapus partisi.
  • Mengubah ukuran partisi (memperbesar dan memperkecil).
  • Memberi label partisi.
  • Menggeser partisi.
  • Meng-copy isi partisi.

Pembahasan akan lebih ditekankan pada langkah nomor 1 hingga 3 dan langkah untuk menyelamatkan partisi hard disk yang terhapus.

Laptop


LAPTOP.Laptop is a very powerful tool in our laptops can listen to, typing, drawing, playing facebook friendster, blogger and played very practical game.Laptop be in play when the bus, car, train, plane anywhere in unless we back up the motorcycle, bajaj and bajaj bemo due in and the very noisy bemo we will be noise by sound-wheeler and bought a laptop bemo.saya worth seven million seratus.laptop which I bought brand can also compact.Laptop for photos-images if there is the camera if that does not mean that there could not kia foto.Jika photo-sometimes in the love of laptop bag for a laptop bag and there was not arbitrary in order not to collide security if we have a laptop should be treated so as not to damage and not to get wet because when exposed to water konslet it will be.

fungsi Processor

Penjelasan Tentang Processor

Nah, melanjutkan pembahasan sebelumnya, sekarang akan kita bahas mengenai komponen komputer yang penting banget yaitu PROCESSOR. Tak terasa sudah masuk bagian ke-5 pembahasan mengenai komponen komputer. Penjelasan kali ini mungkin akan sedikit panjang, dan akan disambung pada penjelasan berikutnya, karena membahas processor sama saja dengan membaca buku setebal 500 halaman. Namun saya akan menjelaskan secara simpel dan mudah dimengerti bagi orang awam, tentunya tidak terlalu mendetail penjelasan tentang processor ini.

Processor atau yang lebih dikenal dengan sebutan CPU (Central Processing Unit), merupakan bagian dari komputer yang berfungsi sebagai pusat untuk memproses segala sesuatu yang akan dilakukan oleh komputer. Boleh dikatakan bahwa processor merupakan otak dari sebuah komputer. Bayangkan saja jika manusia tidak memiliki otak, maka tentunya manusia tersebut tidak dapat berbuat apa-apa, dan bisa dikatakan sebagai mayat hidup (kaya zombie donk). Apapun aktivitas yang dilakukan oleh komputer, yang memprosesnya adalah processor.

Silahkan lihat gambar processor dibawah ini !

Merunut sejarah, processor telah banyak mengalami revolusi/perubahan, baik dari segi bentuk/arsitektur, fungsi dan juga kecepatan. Dari jaman processor keluaran Intel yaitu processor Intel 4004 (Generasi awal tapi bukan yang pertama) hingga saat ini yaitu Intel Core 2 Processor. Perbedaannya tentu sangat-sangat jauh baik dari segi bentuk, fungsi dan kecepatan. Intel 4004 memiliki clock speed sebesar 108KHz, jumlah transistor 2300, belum terdapat cache, bus speed 108 KHz, dan berfungsi untuk manipulasi aritmatika dasar. Processor Intel Core 2 Processor memiliki clock speed sebesar 3,2 GHz, jumlah transistor sebanyak 820 juta, cache sebesar 12 MB, bus speed 1600 MHz, dan memiliki fungsi yang sangat kompleks untuk multimedia, komputasi dan sebagainya (fungsi komputer saat ini).

Lihat gambar dibawah ini !

Intel 4004

Intel Core 2 Processor

Fungsi sebuah processor dalam komputer sangatlah penting, karena processor merupakan pusat untuk mengontrol dan memproses kerja sebuah komputer. Sebagai contoh fungsi dari processor adalah ketika Anda hendak menjalankan sebuah aplikasi seperti memutar lagu pada sebuah player seperti Winamp. Pertama-tama tentunya Anda akan mengklik icon Winamp untuk memainkan lagu yang Anda inginkan. Ketika Anda klik Winamp, mouse memberikan sinyal kepada komputer Anda melalui kabel mouse menuju mainboard Anda. Kemudian mainboard melalui jalur khusus, sinyal tersebut diteruskan melalui sebuah jalur BUS yang akan menuju ke Memori Utama, setelah diregister di memori utama, baru kemudian diteruskan menuju Processor untuk diolah sinyal yang dikirimkan tersebut. Setelah processor memproses sinyal tersebut (pengecekan request sinyal tersebut dapat dipenuhi atau tidak), processor akan mengirimkan sinyal kembali kepada komponen-komponen lainnya yang diperlukan untuk menjalankan program Winamp tersebut (seperti harddisk, memory dan sebagainya). Barulah program Winamp akan tampil di monitor Anda.

Perlu Anda ketahui, processor hanya dapat mengenali instruksi dengan notasi bilangan Biner (ex.01010001010). Merupakan notasi untuk perangkat elektronik dimana bilangan NOL (0) menandakan tidak terdapat sinyal listrik, dan bilangan SATU (1) menandakan adanya sinyal listrik. Tentunya urutan proses tersebut tidak dapat dibayangkan hanya sekejap mata saja, karena kecepatan processor yang dapat mencapai 3,2 GHz (3200 Juta getaran perdetik), jadi prosesnya sangat cepat hanya sepersekian mili detik saja.

Pada awalnya, processor hanya difungsikan untuk pengolahan aritmatika saja, seperti halnya kalkulator pada saat ini. Namun sekarang ini processor telah bergeser fungsinya mengarah ke multimedia.

BERSAMBUNG….

Senin, 24 Agustus 2009

My Handpone


Handpone.Pada on four two thousand eight handpane I got from my parents because on the fourth of two thousand eight birthday and I finally I got a nokia handpone although not too good but I should be grateful because it was purchased by handpone that money.Handpone communication tools practical for small and practical shape then almost everyone has handpone, because handpone also must have berinternet.Semua people unless handpone unable yag. therefore we should appreciate what has ada.Aku pleased handpone if I get bored I can listen to songs mantab-song and if I was tired of me playing on facebook handpone because the longer it will be more modern times such as electronic devices such as handpone, computers, laptops and other lain.handpone was a very sophisticated tool because we can see the weather on - date without seeing the calendar and we can use without wearing handpone can listrik.di handpone posed for pictures in his camera handpone there. Handpone there are several kinds such as handpone nokia, sony erecsen and much lagi.Itulah progress over time, although Indonesia not too sophisticated, but we have improved Indonesia
> swap


Senin, 10 Agustus 2009

Motherboard

Motherboard

From Wikipedia, the free encyclopedia

Jump to: navigation, search
Motherboard

The ASUS A8N VM CSM
Connects to Microprocessors via one of:
  • sockets
  • Slots (on older motherboards)

Main memory via one of:

  • Slots
  • Sockets for individual chips (on old motherboards)

Peripherals via one of:

Expansion cards via one of:

Form factors ATX
microATX
AT (on older motherboards)
Baby AT (on older motherboards)
Others
Common manufacturers ASUS
Foxconn
Intel
XFX
Others

A motherboard is the central printed circuit board (PCB) in some complex electronic systems, such as modern personal computers. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple computers, the logic board.[1] It is also sometimes casually shortened to mobo.[2]

Contents

[hide]

[edit] History

Prior to the advent of the microprocessor, a computer was usually built in a card-cage case or mainframe with components connected by a backplane consisting of a set of slots themselves connected with wires; in very old designs the wires were discrete connections between card connector pins, but printed-circuit boards soon became the standard practice. The central processing unit, memory and peripherals were housed on individual printed circuit boards which plugged into the backplane.

During the late 1980s and 1990s, it became economical to move an increasing number of peripheral functions onto the motherboard (see below). In the late 1980s, motherboards began to include single ICs (called Super I/O chips) capable of supporting a set of low-speed peripherals: keyboard, mouse, floppy disk drive, serial ports, and parallel ports. As of the late 1990s, many personal computer motherboards supported a full range of audio, video, storage, and networking functions without the need for any expansion cards at all; higher-end systems for 3D gaming and computer graphics typically retained only the graphics card as a separate component.

The early pioneers of motherboard manufacturing were Micronics, Mylex, AMI, DTK, Hauppauge, Orchid Technology, Elitegroup, DFI, and a number of Taiwan-based manufacturers.

Popular personal computers such as the Apple II and IBM PC had published schematic diagrams and other documentation which permitted rapid reverse-engineering and third-party replacement motherboards. Usually intended for building new computers compatible with the exemplars, many motherboards offered additional performance or other features and were used to upgrade the manufacturer's original equipment.

The term mainboard is archaically applied to devices with a single board and no additional expansions or capability. In modern terms this would include embedded systems, and controlling boards in televisions, washing machines etc. A motherboard specifically refers to a printed circuit with the capability to add/extend its performance/capabilities with the addition of "daughterboards".

[edit] Overview

An Acer E360 motherboard made by Foxconn, from 2005, with a large number of integrated peripherals. This board's nForce3 chipset lacks a traditional northbridge.

Most computer motherboards produced today are designed for IBM-compatible computers, which currently account for around 90% of global PC sales[citation needed]. A motherboard, like a backplane, provides the electrical connections by which the other components of the system communicate, but unlike a backplane, it also hosts the central processing unit, and other subsystems and devices.

Motherboards are also used in many other electronics devices such as mobile phones, stop-watches, clocks, and other small electronic devices.

A typical desktop computer has its microprocessor, main memory, and other essential components on the motherboard. Other components such as external storage, controllers for video display and sound, and peripheral devices may be attached to the motherboard as plug-in cards or via cables, although in modern computers it is increasingly common to integrate some of these peripherals into the motherboard itself.

An important component of a motherboard is the microprocessor's supporting chipset, which provides the supporting interfaces between the CPU and the various buses and external components. This chipset determines, to an extent, the features and capabilities of the motherboard.

Modern motherboards include, at a minimum:

  • sockets (or slots) in which one or more microprocessors are installed[3]
  • slots into which the system's main memory is installed (typically in the form of DIMM modules containing DRAM chips)
  • a chipset which forms an interface between the CPU's front-side bus, main memory, and peripheral buses
  • non-volatile memory chips (usually Flash ROM in modern motherboards) containing the system's firmware or BIOS
  • a clock generator which produces the system clock signal to synchronize the various components
  • slots for expansion cards (these interface to the system via the buses supported by the chipset)
  • power connectors flickers, which receive electrical power from the computer power supply and distribute it to the CPU, chipset, main memory, and expansion cards.[4]
The Octek Jaguar V motherboard from 1993.[5] This board has 6 ISA slots but few onboard peripherals, as evidenced by the lack of external connectors.

Additionally, nearly all motherboards include logic and connectors to support commonly-used input devices, such as PS/2 connectors for a mouse and keyboard. Early personal computers such as the Apple II or IBM PC included only this minimal peripheral support on the motherboard. Occasionally video interface hardware was also integrated into the motherboard; for example on the Apple II, and rarely on IBM-compatible computers such as the IBM PC Jr. Additional peripherals such as disk controllers and serial ports were provided as expansion cards.

Given the high thermal design power of high-speed computer CPUs and components, modern motherboards nearly always include heat sinks and mounting points for fans to dissipate excess heat.

[edit] CPU sockets

A CPU socket or CPU slot is an electrical component that attaches to a printed circuit board (PCB) and is designed to house a CPU (also called a microprocessor). It is a special type of integrated circuit socket designed for very high pin counts. A CPU socket provides many functions, including providing a physical structure to support the CPU, providing support for a heat sink, facilitating replacement (as well as reducing cost) and most importantly forming an electrical interface both with the CPU and the PCB. CPU sockets can most often be found in most desktop and server computers (laptops typically use surface mount CPUs), particularly those based on the Intel x86 architecture on the motherboard.

[edit] Integrated peripherals

Block diagram of a modern motherboard, which supports many on-board peripheral functions as well as several expansion slots.

With the steadily declining costs and size of integrated circuits, it is now possible to include support for many peripherals on the motherboard. By combining many functions on one PCB, the physical size and total cost of the system may be reduced; highly-integrated motherboards are thus especially popular in small form factor and budget computers.

For example, the ECS RS485M-M,[6] a typical modern budget motherboard for computers based on AMD processors, has on-board support for a very large range of peripherals:

Expansion cards to support all of these functions would have cost hundreds of dollars even a decade ago, however as of April 2007 such highly-integrated motherboards are available for as little as $30 in the USA.

[edit] Peripheral card slots

A typical motherboard of 2009 will have a different number of connections depending on its standard. A standard ATX motherboard will typically have 1x PCI-E 16x connection for a graphics card, 2x PCI slots for various expansion cards and 1x PCI-E 1x which will eventually supersede PCI.

A standard Super ATX motherboard will have 1x PCI-E 16x connection for a graphics card. It will also have a varying number of PCI and PCI-E 1x slots. It can sometimes also have a PCI-E 4x slot. This varies between brands and models.

Some motherboards have 2x PCI-E 16x slots, to allow more than 2 monitors without special hardware or to allow use of a special graphics technology called SLI (for Nvidia) and Crossfire (for ATI). These allow 2 graphics cards to be linked together, to allow better performance in intensive graphical computing tasks, such as gaming and video-editing.

As of 2007, virtually all motherboards come with at least 4x USB ports on the rear, with at least 2 connections on the board internally for wiring additional front ports that are built into the computer's case. Ethernet is also included now. This is a standard networking cable for connecting the computer to a network or a modem. A sound chip is always included on the motherboard, to allow sound to be output without the need for any extra components. This allows computers to be far more multimedia-based than before. Cheaper machines now often have their graphics chip built into the motherboard rather than a separate card.

[edit] Temperature and reliability

Motherboards are generally air cooled with heat sinks often mounted on larger chips, such as the northbridge, in modern motherboards. If the motherboard is not cooled properly, it can cause the computer to crash. Passive cooling, or a single fan mounted on the power supply, was sufficient for many desktop computer CPUs until the late 1990s; since then, most have required CPU fans mounted on their heat sinks, due to rising clock speeds and power consumption. Most motherboards have connectors for additional case fans as well. Newer motherboards have integrated temperature sensors to detect motherboard and CPU temperatures, and controllable fan connectors which the BIOS or operating system can use to regulate fan speed. Some higher-powered computers (which typically have high-performance processors and large amounts of RAM, as well as high-performance video cards) use a water-cooling system instead of many fans.

Some small form factor computers and home theater PCs designed for quiet and energy-efficient operation boast fan-less designs. This typically requires the use of a low-power CPU, as well as careful layout of the motherboard and other components to allow for heat sink placement.

A 2003 study[7] found that some spurious computer crashes and general reliability issues, ranging from screen image distortions to I/O read/write errors, can be attributed not to software or peripheral hardware but to aging capacitors on PC motherboards. Ultimately this was shown to be the result of a faulty electrolyte formulation.[8]

For more information on premature capacitor failure on PC motherboards, see capacitor plague.

Motherboards use electrolytic capacitors to filter the DC power distributed around the board. These capacitors age at a temperature-dependent rate, as their water based electrolytes slowly evaporate. This can lead to loss of capacitance and subsequent motherboard malfunctions due to voltage instabilities. While most capacitors are rated for 2000 hours of operation at 105 °C,[9] their expected design life roughly doubles for every 10 °C below this. At 45 °C a lifetime of 15 years can be expected. This appears reasonable for a computer motherboard, however many manufacturers have delivered substandard capacitors,[citation needed] which significantly reduce life expectancy. Inadequate case cooling and elevated temperatures easily exacerbate this problem. It is possible, but tedious and time-consuming, to find and replace failed capacitors on PC motherboards; it is less expensive to buy a new motherboard than to pay for such a repair.[citation needed]

[edit] Form factor

microATX form factor motherboard

Motherboards are produced in a variety of sizes and shapes ("form factors"), some of which are specific to individual computer manufacturers. However, the motherboards used in IBM-compatible commodity computers have been standardized to fit various case sizes. As of 2007, most desktop computer motherboards use one of these standard form factors—even those found in Macintosh and Sun computers which have not traditionally been built from commodity components.

Laptop computers generally use highly integrated, miniaturized, and customized motherboards. This is one of the reasons that laptop computers are difficult to upgrade and expensive to repair. Often the failure of one laptop component requires the replacement of the entire motherboard, which is usually more expensive than a desktop motherboard due to the large number of integrated components.

[edit] Nvidia SLI and ATI Crossfire

Nvidia SLI and ATI Crossfire technology allows two or more of the same series graphics cards to be linked together to allow faster graphics-processing capabilities. Almost all medium- to high-end Nvidia cards and most high-end ATI cards support the technology.

They both require compatible motherboards. There is an obvious need for 2x PCI-E 16x slots to allow two cards to be inserted into the computer. The same function can be achieved in 650i motherboards by NVIDIA, with a pair of x8 slots. Originally, tri-Crossfire was achieved at 8x speeds with two 16x slots and one 8x slot; albeit at a slower speed. ATI opened the technology up to Intel in 2006, and all new Intel chipsets now support Crossfire.

SLI is a little more proprietary in its needs. It requires a motherboard with Nvidia's own NForce chipset series to allow it to run (exception: select Intel X58 chipset based motherboards).

It is important to note that SLI and Crossfire will not usually scale to 2x the performance of a single card when using a dual setup. They also do not double the effective amount of VRAM or memory bandwidth.

[edit] Bootstrapping using the BIOS

Motherboards contain some non-volatile memory to initialize the system and load an operating system from some external peripheral device. Microcomputers such as the Apple II and IBM PC used read-only memory chips, mounted in sockets on the motherboard. At power-up, the central processor would load its program counter with the address of the boot ROM, and start executing ROM instructions, displaying system information on the screen and running memory checks, which would in turn start loading memory from an external or peripheral device (disk drive). If none is available, then the computer can perform tasks from other memory stores or display an error message, depending on the model and design of the computer and version of the BIOS.

Most modern motherboard designs use a BIOS, stored in an EEPROM chip soldered to the motherboard, to bootstrap the motherboard. (Socketed BIOS chips are widely used, also.) By booting the motherboard, the memory, circuitry, and peripherals are tested and configured. This process is known as a computer Power-On Self Test (POST) and may include testing some of the following devices: