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my 7900GT is running at x8 in a x16 slot ???

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  • Graphics Cards
  • Asus
  • SLI
  • Overclocking
Last response: in Overclocking
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July 29, 2006 8:39:37 AM

asus a8n sli deluxe

2 x PCI Express x16 slot
*SLI mode : x8 , x8
*Default(Single VGA) mode : x16, x1

dfi infinity sli
in SLI mode the bandwidth of each x16 slot operates at x8.
when the graphics cards are connected by the bridge it runs at 16x.

on asus 1 card = x16 2 card = x8 EACH
on dfi 1 card = x8 2 card = 16x each

or am i just stupid. lol.

More about : 7900gt running x16 slot

July 31, 2006 8:09:03 AM

read my post again. with NO sli bridge it runs at 8x. with it they both run at x16, but why is mine running at x8 when im only running 1 card?

on the asus it says it will run at x16 with 1 card.

also could this be hurting the performance of my card. im only getting 3900 on 3dmark. others are getting 4000 and 4100. with almost the same specs as my computer.
July 31, 2006 10:24:35 AM

Just a thought.

Maybe you should try the video card in the other PCI-e 16x slot.
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July 31, 2006 11:44:48 AM

Don't worry about it for mobos with 2x16 and 2x8 bandwiths don't have of big difference in real gaming applications.
August 1, 2006 6:36:11 AM

Thats just a lie, the bridge connector does not and cannot give the chipset more availible PCI-E lanes to split between the two slots.

It can reduce the PCI-E bandwidth needed as without it data needs to be sent over the PCI-E bus between cards.

In practice the difference between 2* PCI-Ex16 slots and 2* PCI-Ex8 slots is negligible, under 5% at worst, and wouldnt be the reason for the lower 3dmark scores you describe.
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