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Old 07-29-2004, 09:38 AM   #1 (permalink)
Yon
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Question PCI Express

On the Asus web page for the Asus P5GD2 Premium http://uk.asus.com/prog/spec.asp?m=P...ium&langs=11#, it says that it's got:
Expansion Slots
1 x PCI Express x16 slot for discrete graphics card
3 x PCI Express x1
2 x PCI

So what is PCI Express x16, and why hasn't it got an AGP slot?
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Old 07-29-2004, 09:54 AM   #2 (permalink)
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PCI Express is what is replacing AGP...the 16x is just for comparison against the AGP 8x...its twice the speed.

PCI Express doesn't suffer from the bottle neck that the old PCI does now.

Hope that helps
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Old 07-29-2004, 09:57 AM   #3 (permalink)
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Are they compatible with the same cards?
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Old 07-29-2004, 11:05 AM   #4 (permalink)
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no...if you wanted to use old cards you would have to stick them into the regular pci slots
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Old 07-29-2004, 12:36 PM   #5 (permalink)
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Yon,
I happened to read an article in computer power user recently that explained it nicely. I'll give you a summation of it.


There are two main differences with AGP and PCI Express. Just because it's the replacement to the AGP standard doesn't mean you should be in any rush to go out and buy one.

1) a PCI Express graphics card will not fit into a AGP slot on your MB as DumDum already stated. Only newer MBs with a PCI express slot support it.

2) PCI express: Has 16 lanes of data and supports 4 GB/sec each direction (to and from the video card) for a total of 8 GB/sec. Now you compare that to the AGP (8 lanes of data) 2 GB/sec data throughput and you immediately see the huge increase. However, according to Nvidia, approximately a quarter of that bandwidth is filled up with data that's necessary to make the bus work. So in essence, you're left with 6 GB/sec.

Furthermore, you shoudl know that not all video games are designed to use the total bandwidth (6 GB/sec). In fact, I don't think there's any games out there currently that are programmed to run that high. Of course, in the future, i'm sure you'll see some gaming houses that will make more and more use of that.
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Old 07-29-2004, 01:04 PM   #6 (permalink)
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http://s3.invisionfree.com/Computek/...p?showtopic=16
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Old 07-29-2004, 01:06 PM   #7 (permalink)
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thanks for the update i was unaware of the bandwidth info
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Old 07-29-2004, 02:06 PM   #8 (permalink)
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Will x800Pro fit into a PCI Express x16 slot?
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Old 07-29-2004, 02:11 PM   #9 (permalink)
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ues there is one version of X800 that is for the PCI-E x16 as well. although they started with AGP primarily.

unlike both X600 and X300, which are both on PCI-E (to my knowledge)
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