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Is my MB hurting crossfire performance?

post #1 of 10
Thread Starter 
Just yesterday I upgraded to a crossfire setup. I am now running 2 5850's.

I have a Gigabyte P67-UD3 motherboard and I noticed that GPU 1 is running at 8x and GPU 2 is running at 4x.

How much do you think this is hurting the performance of my dual 5850's?

Besides the GB UD7 it doesn't seem like there are any other boards that will run dual at 16x. Most are dual at 8x. Would this be a good jump in performance from 8x/4x to 8x/8x?
Edited by trentiles - 1/28/11 at 5:43am
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post #2 of 10
Thread Starter 
Well after doing some reading on this topic some think it's worthwhile to upgrade while others don't. Anyone know of any crossfire benchmarks comparing pcie lane speeds?
Edited by trentiles - 1/28/11 at 6:36am
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post #3 of 10
i know that there isn’t much difference between 16x and 8x but I’m sure there is one between 8x and 4x and bigger one between 16x and 4x.
there is a 10% to 15% difference between x8 and x16 and it barely noticeable
    
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post #4 of 10
http://www.hardocp.com/article/2010/...6x16_vs_x4x4/1
Read here - its very clearly said that you won't notice any difference.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Vipervlv View Post
http://www.hardocp.com/article/2010/...6x16_vs_x4x4/1
Read here - its very clearly said that you won't notice any difference.
Thanks for that link. They did matched speeds, I wonder if 8x/4x would be any different. According to that test though there shouldn't be, especially since I won't be gaming at the resolutions they were.
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post #6 of 10
P67-UD3

What I got from vipers link is that even at X4 2.0 you still get great performance
and according to the Gigabyte website all the PCIe slots on the board conform to 2.0 standard
sounds golden
Edited by slickwilly - 1/28/11 at 6:52am
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post #7 of 10
How does it benchmark ? The minimum I would go is a mobo with 8x + 8x pcie 2.0.

Are both your gpus running at 4x ? Screenie plzz lol...

gl
post #8 of 10
Thread Starter 
Screens will have to wait until after work. I think I will also run some benchmarks with a single 5850 running at 16x and then xfire'd 5850's running at 8x/4x.

Besides 3dmark 06/vantage/11, and heaven, are there any other benches people would like to see?
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post #9 of 10
Thread Starter 
So I was going to do some benches but I noticed that even with a single vid card in the first pcie slot will only run at 8x instead of the 16x that Gigabyte advertises for this board, ***. I wish I had just spend the extra to get the P67A-UD4
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post #10 of 10
I would call Gigabyte support on this one
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