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Why sli at x8

post #1 of 14
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why would i sli at 8x? would it be better just to buy a better single card and run at 16x.
post #2 of 14
Quote:
Originally Posted by KEITHRH12 View Post
why would i sli at 8x? would it be better just to buy a better single card and run at 16x.
There's no discernible difference between 8x and 16x.
post #3 of 14
x8 is fast enough for everything but the absolute fastest single card. x8 isn't really holding anything back.
    
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post #4 of 14
running a x8 x8 sli or crossfire configuration will only bottleneck very powerful cards. think gtx 560ti, amd 6950 and on up. the performance difference is minimal. you're looking at getting 90% or better of your cards full capacity even running at x8. believe me, I looked into this thoroughly before purchasing my am3+ board as I plan on buying another 6970 when I need it. I'm sure plenty of other people will back me up here because this is where i got my links/information from.
post #5 of 14
I don't think there's a single card that can take advantage of the full x8 bandwidth, let alone x16.

Even if you were sli'ing two cards that could take advantage of the bandwidth, you'd still have twice the shaders and VRAM.
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post #6 of 14
Quote:
Originally Posted by danielwiley View Post
running a x8 x8 sli or crossfire configuration will only bottleneck very powerful cards. think gtx 560ti, amd 6950 and on up. the performance difference is minimal. you're looking at getting 90% or better of your cards full capacity even running at x8. believe me, I looked into this thoroughly before purchasing my am3+ board as I plan on buying another 6970 when I need it. I'm sure plenty of other people will back me up here because this is where i got my links/information from.
even this is innaccurate

there may be some performance lost but running two 6970's in xfire with a x8/x8 SB 2500k had much better GPU scores across all benchmakrs then the same setup with 2 full x16 lanes and a OC'd amd 965.

So there are much more important things to worry
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post #7 of 14
I believe that 2x GTX590's will be effected by 8x/8x for sure though. Since there is actually 2 cards in one slot then for a total of 4 cards in 2.
post #8 of 14
No difference between 8x and 16x.
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post #9 of 14
Quote:
Originally Posted by danielwiley View Post
running a x8 x8 sli or crossfire configuration will only bottleneck very powerful cards. think gtx 560ti, amd 6950 and on up. the performance difference is minimal. you're looking at getting 90% or better of your cards full capacity even running at x8. believe me, I looked into this thoroughly before purchasing my am3+ board as I plan on buying another 6970 when I need it. I'm sure plenty of other people will back me up here because this is where i got my links/information from.

580 SLI is less than a 5% drop on a P55 chipset, which is actually half the bandwidth, so there isn't even much of a difference between 16x/16x and 4x/4x.
    
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post #10 of 14
i cant find it right now but they showed in a review showing a less then 5% loss with 2 5970's
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