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Does the Radeon 6950 Utilize the Full Power of PCI x 16 slot?

post #1 of 10
Thread Starter 
My question is the subject line.

The reason I'm asking is because I have a Gigabyte X58-UD3R motherboard with Dual Radeon 6950s.

Currently, the video cards are sandwiched together taking up slots 1 and 3 and the heat buildup on the top card is much higher than the bottom, but they're bothing running at PCI x 16 speeds.

I believe that if I change the second card position to slot 4, it will create less heat but won't be PCI x 16 anymore

Now I heard that most video cards, including high-end cards, don't even fully utilize the full power of a PCI x 16 slot. So does anyone here have their card(s) running below PCI x 16 speeds and notice a performance decrease in games?
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post #2 of 10
Regardless of changing the bandwidth speed of the PCI-e slot, heat generation is going to be the same. Having your bottom PCI-e slot running at x4 will just make the 6950 not running at it's full potential, as in you'll get a few frames less in games.
     
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post #3 of 10
What speed is the other slot? x8 doesn't make a difference, x4 doesn't on weak - mid cards, but it might with those.

EDIT: check out this: http://www.hardocp.com/article/2010/...x16x16_vs_x4x4
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post #4 of 10
The 6950 won't saturate the x16 slot

I'm not sure if it will saturate an 8x slot, but even if it does you're unlikely to notice much of a difference.

Best way to find out is to try it out. Run a few benchmarks with them both at x16 then not. (then post the results here for people to see!)
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post #5 of 10
Don't worry. The different will be very small if you move it into the x4 slot, and should free up a slot from which your top card can breath. Don't worry, just go for it.
    
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post #6 of 10
The difference between x16 and x8 is somewhere in the neighborhood of a 4% performance loss. It memory serves its actually quite a bit higher between x16 and x4 slots but still not a performance killer.
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post #7 of 10
Thread Starter 
What if both cards are overclocked? Will it still be a noticeable performance lost?
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post #8 of 10
IMO you should move the second card to slot 4 as the small drop in FPS is something you can live with compared to burning up the card, and in cross-fire you not using 100% of the second card anyway...
    
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Sync_Bit View Post
IMO you should move the second card to slot 4 as the small drop in FPS is something you can live with compared to burning up the card, and in cross-fire you not using 100% of the second card anyway...
I think my plans have changed... The crossfire bridge isn't even long enough to reach from Slot 1 to Slot 4 :\\
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post #10 of 10
Quote:
Originally Posted by Conjuror View Post
I think my plans have changed... The crossfire bridge isn't even long enough to reach from Slot 1 to Slot 4 :\\

Check here http://www.newegg.com/Product/Produc...82E16814999002

Looks like it is longer than the standard bridge...
    
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