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Crossfire help - Page 3

post #21 of 24
Quote:
Originally Posted by grunion View Post
Those aren't even cfx results.

I can tell you from firsthand experience that the 4x slot is a handicap when running cfx.
Granted that most of the time without an fps counter you wouldn't notice.

I'll use BC2 as an example, I experienced many noticeable slowdowns at 16x/4x, 8x/8x exhibited no such slowdowns.

The 4x card is always 10-20% bottlenecked.


Attachment 194525

Attachment 194526

Attachment 194527
Unfortunately, hard evidence over the 16x-4x doesn't show the "slowdowns" that you noticed, on a number of applications.
http://www.overclock.net/nvidia/8193...6x-4x-gtx.html
http://www.hardocp.com/article/2010/...16x16_vs_x4x4/
Unless SLI has figured out some magical way of scaling over 4x slots that AMD doesn't know about.
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post #22 of 24
Quote:
Originally Posted by Nixuz View Post
Unfortunately, hard evidence over the 16x-4x doesn't show the "slowdowns" that you noticed, on a number of applications.
http://www.overclock.net/nvidia/8193...6x-4x-gtx.html
http://www.hardocp.com/article/2010/...16x16_vs_x4x4/
Unless SLI has figured out some magical way of scaling over 4x slots that AMD doesn't know about.
Post all the "hard evidence" you want, I know what I experienced, the bandwidth discrepancy can be unkind to my cards.
Compared to h220wnzj00 numbers, I saw twice the % loss that he experienced.

Vantage 36098 vs 32009, gpu score, total isn't relevant.
JC2 103 vs 92
Those are the only 2 test we have in common.
But like I said not noticeable for the most part unless you look at numbers, but BC2 was the exception.

It just ridiculous to tell a person to go ahead and get a 16x/4x board when they plan on running crossfire.
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post #23 of 24
It's ridiculous to get a 16x/4x board, based upon your personal observations versus several sites showing that the performance difference is, at most, 5%?
I'm not saying that you didn't see what you claim to have seen, but you have to admit that it would be a stretch to dismiss several well respected sites conclusions based upon one persons negative personal experience.
Anyway, I expect we will continue to see more tests of this nature as more people, like myself, upgrade with the 16x/4x boards that they have handy.
As soon as AM3+ boards are available for a decent price, I'll try to get my hands on a 16x/16x and use everything else from my current setup, (barring RAM of course), to see what, if any, discrepancies I can reproduce.
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post #24 of 24
Thread Starter 
Will this work with my tx650w to enable crossfire? (It only has 2 pci 6 pin connectors)
http://www.overclockers.co.uk/showpr...id=153&subcat= I would need two of these
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