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Sunday, February 15, 2004 12:12:08 AM
The difference is PCI Express video cards on Intel's platform won't need to go through the CPU bus to get to system memory. On AMD's platform a video card would have to go through HT to get to memory because the memory lives on the other side of the northbridge built into the CPU.
I still argue the small latency penalty for translation from PCI Express to HT is going to make almost no difference in the real world. Video cards don't need low latency access to main memory. They need high bandwidth.
Now that I have stated this in 3 posts, I think I will let it settle out. :)
edit: I see he was claiming something else not related to system memory, with the processor sending a request to a PCI express device. In that case, consider this:
AMD CPU -> On chip connect -> NB -> HT -> HT/PCI Express Tunnel -> PCI Express
INTC CPU -> CPU FSB -> NB -> PCI Express
One less 'hop' for INTC, although AMD's connection between the CPU and NB are on die, and the NB runs at the processor speed may completely negate the extra hop. You could almost treat the AMD CPU+NB as one device:
AMD CPU/NB -> HT -> HT/PCI Express Tunnel -> PCI Express
INTC CPU -> CPU FSB -> NB -> PCI Express
HailMary
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