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[TT]4850x4 sort of worky now - Page 3

post #21 of 24
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even if x4 was slowing them down, it shouldn't actually lower performance, just not improve it that much right?

So besides the hardware limitation, there is still a driver issue.
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post #22 of 24
Quote:
Originally Posted by Sparhawk View Post
They definitely should have used a different motherboard...

from the asus site:
4 x PCIe x16 (@ x16, x16, x4, x4) (Dual PCIe 2.0 x 16)


Did you read the link?

Quote:
The feature that we really care about today is the fact it has four PCI Express x16 slots. While ASUS use a x16/x16/x4/x4 configuration
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post #23 of 24
Quote:
Originally Posted by Ando View Post
Did you read the link?
Did you?

Quote:
However, the feature that we really care about today is the fact it has four PCI Express x16 slots. While ASUS use a x16/x16/x4/x4 configuration, it’s really one of the best on the market.
I get the impression that despite the fact it has 2 slots with the full 16 lanes and the other 2 only have 4, they used it anyway, and looking at the system configuration on the test setup page confirmed that. Just because it has 4 x16 PCIe slots doesn't mean that it has the bandwidth for them all to be running at x16 speeds. There is a difference

Quote:
Originally Posted by joemaniaci
even if x4 was slowing them down, it shouldn't actually lower performance, just not improve it that much right?
Not necessarily, it's going to depend on the driver configuration. If the AFR is implemented in the driver to render frames 1,2,3,4 on GPUs 1,2,3,4 respectively, then while frames 1 & 2 will be completed in a timely manner because those cards have the full x16 bandwidth available to them, it's possible that it could stall because it's waiting for GPUs 3 & 4 to catch up since they only have a fraction of the bandwidth available. The only way to find out for sure would be to retest using a motherboard with x16/x16/x16/x16.

Actually, now that I think about it, even an x8/x8/x8/x8 motherboard should work because there would be a consistent amount of bandwidth for each card. Although the results for CrossFiring 2 cards would not be as high as in this review, it would at least show if scaling beyond 2 cards is working.
Edited by darkcloud89 - 6/22/08 at 9:30pm
post #24 of 24
the more you have working at once, the more that can go wrong.
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