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No performance decrease on Crossfire x4/x4???

post #1 of 12
Thread Starter 
Will someone please explain this to me? How the heck is the bandwidth not being saturated yet and performance decreased?

http://www.hardocp.com/article/2010/...x16x16_vs_x4x4

I was trying to research crossfiring on my board and came across this. I was not considering crossfiring when I got my board but then I saw the BF3 trailer... change of mind.
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post #2 of 12
Its fairly impossible for a graphics card to use all the bandwidth of a 16x pci-e slot. Thats why there is not much of a performance loss compaired to 16x16 and 8x8 even with high end cards. Its possible that a HD 6850 doesnt use all the bandwidth provided on a 4x slot. This would explain why there isnt a performance loss in your crossfire
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post #3 of 12
yeah seeing this has got me thinking about getting another 6970 at some point... (considering my board is 16x4x)

the one thing that puts me off is the fear of microstutter
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post #4 of 12
Quote:
Originally Posted by nibnab View Post
yeah seeing this has got me thinking about getting another 6970 at some point... (considering my board is 16x4x)

the one thing that puts me off is the fear of microstutter
Don't fear, the testing that I have done so far with my 6850's resulted in no noticeable stuttering in any games i've played, except for starcraft 2, which doesn't support crossfire properly anyways.

Also, I'm currently running x16, x4 until I get my new board, and my performance results are great.
Edited by Behemoth777 - 3/3/11 at 3:06pm
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post #5 of 12
Quote:
Originally Posted by Behemoth777 View Post
Don't fear, the testing that I have done so far with my 6850's resulted in no noticeable stuttering in any games i've played, except for starcraft 2, which doesn't support crossfire properly anyways.

Also, I'm currently running x16, x4 until I get my new board, and my performance results are great.
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by Behemoth777 View Post
Don't fear, the testing that I have done so far with my 6850's resulted in no noticeable stuttering in any games i've played, except for starcraft 2, which doesn't support crossfire properly anyways.

Also, I'm currently running x16, x4 until I get my new board, and my performance results are great.
Sweet!
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post #7 of 12
Quote:
Originally Posted by Krusher33 View Post
Will someone please explain this to me? How the heck is the bandwidth not being saturated yet and performance decreased?

http://www.hardocp.com/article/2010/...x16x16_vs_x4x4

I was trying to research crossfiring on my board and came across this. I was not considering crossfiring when I got my board but then I saw the BF3 trailer... change of mind.
That's because the 480 is so BA it makes its own bandwidth.

Quote:
Originally Posted by nibnab View Post
yeah seeing this has got me thinking about getting another 6970 at some point... (considering my board is 16x4x)

the one thing that puts me off is the fear of microstutter
8/8x vs 16/4x
Not much of a difference until you look at it like this, my 5870CFX basically became 5850CFX at 16/4x.

And Vantage
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post #8 of 12
People who have never used dual gpu setup's should really try them, especially crossfire. Never tried sli, but crossfire has always been good to me, first with 4770's, and now with 6850's.
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post #9 of 12
Thread Starter 
I did SLI with 7600GT's. Obviously I wasn't impressed. Who would be with 7600GT's? But I checked out Anandtech's benchmarks comparison. I think it'll be different with HD6850's.
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by grunion View Post
That's because the 480 is so BA it makes its own bandwidth.



8/8x vs 16/4x
Not much of a difference until you look at it like this, my 5870CFX basically became 5850CFX at 16/4x.

And Vantage
So a pair of 6850's may perform like a pair of 5770's? Or could it be that 5870 uses more of the lanes than a 6850 does and it wouldn't have much of a difference as your test shows?
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