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Hardware
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Sunday, 06 June 2004 |
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Page 4 of 11
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Interface
Your video card's interface is what connects it to the computer's main memory. The main memory is where the CPU fetches the data and instructions it needs to perform tasks.
The latest interface is called AGP (Accelerated Graphics Port). Your motherboard may have an AGP1x/2x slot, an AGP4x slot, or no AGP slot at all. If you don't have an AGP slot, then you'll have to purchase a PCI video card. AGP has a much higher bandwidth than PCI (the higher the bandwidth, the faster data can be transmitted), which makes it preferable. However, a PCI card is just fine for most business applications--just not for 3D games etc.
AGP requires software support from your operating system, graphics card, and graphics drivers. Windows '98 has built-in support for AGP, but Windows '95 does not.
This table shows how the interfaces compare. AGP 2x is able to achieve its high bandwidth by making two data transfers per clock cycle-one on the rising edge of the clock pulse and one on the falling edge. AGP 4x makes 4 transfers per clock cycle. |
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Interface Type |
Width (bits) |
Width (Bytes) |
Speed |
Bandwidth (data throughput) |
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PCI Bus |
32 bits |
4 Bytes |
33 MHz |
133 MB/sec |
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AGP 1x |
32 bits |
4 Bytes |
66 MHz |
266 MB/sec |
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AGP 2x |
32 bits (x2) |
4 Bytes (x2) |
66 MHz |
533 MB/sec |
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AGP 4x |
32 bits (x4) |
4 Bytes (x4) |
66 MHz |
1066 MB/sec |
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