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An expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard to add additional functionality to a computer system. One edge of the expansion card holds the contacts (the edge connector) that fit exactly into the slot. They establish the electrical contact between the electronics (mostly integrated circuits) on the card and on the motherboard. Connectors mounted on the bracket allow the connection of external devices to the card. Depending on the form factor of the motherboard and case, around one to seven expansion cards can be added to a computer system. In the case of a backplane system, up to 19 expansion cards can be installed. There are also other factors involved in expansion card capacity. For example, some expansion cards need two slots like some nVidia GeForce FX and newer GeForce graphics cards and there is often a space left to aid cooling on some high-end cards. Some cards are "low-profile" cards, meaning that they are shorter than standard cards and will fit in a lower height computer chassis. The group of expansion cards that are used for external connectivity, such as a network, SAN or modem card, are commonly referred to as input/output cards (or I/O cards). The primary purpose of an expansion card is to provide or expand on features not offered by the motherboard. For example, the original IBM PC did not provide graphics or hard drive capability as the technology for providing that on the motherboard did not exist. In that case, a graphics expansion card and an ST-506 hard disk controller card provided graphics capability and hard drive interface respectively. In the case of expansion of on-board capability, a motherboard may provide a single serial RS232 port or Ethernet port. An expansion card can be installed to offer multiple RS232 ports or multiple and higher bandwidth Ethernet ports. In this case, the motherboard provides basic functionallity but the expansion card offers additional or enhanced ports.

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Articles

Global Cooperation Vital for Mining Industry in Liaoning

China is stepping up its efforts to strengthen international cooperation in the mining industry as part of a bid to meet the huge demand of the globally recovering economy and resurgent mineral resource prices.

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US Senate panel OKs healthcare bill

A key US Senate committee endorsed a sweeping healthcare overhaul on Tuesday, gaining the support of an influential Republican and delivering President Barack Obama a victory on his top domestic priority.

[Read more]

Govt to raise oil reserve enough to last 90 days

China will stockpile a third phase of strategic oil reserves after the second phase is finished, in a move to meet international standards of reserve capacity, a senior energy official said Friday.

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Zhejiang first large scale art performance tour held on September 26 on Zhijiang road of Qianjiang N

The 60th anniversary of New China is approaching near, and a celebration art performance tour sponsored by Zhejiang Publicity Department.

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BaoSteel signs contract for land use with Xiamen

Recently BaoSteel International Economic & Trading Co Ltd signed the agreement for land use with Xiamen Torch High-tech Industrial Development Zone and will build the project of Baosteel International Xiamen Steel Processing Centre in this development zone.

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Total records: 60
ARTICLES
Global Cooperation Vital for Mining Industry in Liaoning
China is stepping up its efforts to strengthen international cooperation in the mining industry as part of a bid to meet the huge demand of the globally recovering economy and resurgent mineral resource prices.
US Senate panel OKs healthcare bill
A key US Senate committee endorsed a sweeping healthcare overhaul on Tuesday, gaining the support of an influential Republican and delivering President Barack Obama a victory on his top domestic priority.
Govt to raise oil reserve enough to last 90 days
China will stockpile a third phase of strategic oil reserves after the second phase is finished, in a move to meet international standards of reserve capacity, a senior energy official said Friday.
Zhejiang first large scale art performance tour held on September 26 on Zhijiang road of Qianjiang N
The 60th anniversary of New China is approaching near, and a celebration art performance tour sponsored by Zhejiang Publicity Department.
BaoSteel signs contract for land use with Xiamen
Recently BaoSteel International Economic & Trading Co Ltd signed the agreement for land use with Xiamen Torch High-tech Industrial Development Zone and will build the project of Baosteel International Xiamen Steel Processing Centre in this development zone.
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I/O Card product category search - help you find I/O Card suppliers by category

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