Reply 20 of 38, by feipoa
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wrote:. PCI-X like conventional PCI is a shared bus. If the specific PCI-X slot you used happens to be shared by something else on the […]
wrote:With the Parhelia in the PCI-X slot, the score was 3854. With the Parhelia in the conventional PCI slot, the score was 4580. Any ideas why the score would be higher with the card in the conventional PCI slot?
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PCI-X like conventional PCI is a shared bus.
If the specific PCI-X slot you used happens to be shared by something else on the motherboard (drive controllers and LAN are common) then the full bandwidth is not available to the video card.It is not uncommon for there to be two or even three independent PCI-X buses on a motherboard.
If you want to use PCI-X video it would be a good idea to find out which PCI-X bus has the least on it.
Manuals for boards with PCI-X usually show what is on what bus in the manual.
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That is a good point. I no longer recall if I looked into that or not. I did these tests some time ago. Let's assume that the gigabit ethernet adapter and the Matrox graphics card are both on the PCI-X bus. If the ethernet adapter is enabled, but not in use (ethernet cable not plugged in), to what extent does this effect the throughput of the Matrox graphics card? If the terhnet adapter is disabled in the BIOS, to what effect does this have on the Matrox graphics card?
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