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post #21 of 23
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Quote:
Originally Posted by tsm106 View Post
No crash on Metro@5040x1050. I can try running in portrait too.

Damn this game is taxing! AB graphs show all 3 gpus taxed at 99%.

Ok, setup F1 2010 in portrait no crash either.
Your only pushing 5.3 mega-pixels, or about 43% of the pixels I am. I've found that the crossfire bridge crashes around 8-mega pixel worth of data. It doesn't work with my 12.3 mega-pixel setup.

Thanks for the input though! Maybe AMD will fix the crossfire bridge next GPU cycle.
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post #22 of 23
I found the tidbit on the limitation. You may be taxing your pcie lanes and/or the latency with the nf chips could be compounding things?

Quote:
Originally Posted by techreport.com
The core issue is the fact that the dedicated CrossFire interconnect used for passing completed frames between cards has "only" enough bandwidth to sustain a 2560x1600 display resolution. Even three 1080p displays will exceed its capacity. The alternative is to transfer frame buffer data via PCI Express, which is what AMD does when necessary. Using PCIe works, but it can limit performance scaling somewhat—don't expect to see the near-linear scaling one might get out of a dual-card setup in the right game with a single display. That's not to say mixing CrossFire with Eyefinity won't be worth doing. Based on AMD's performance estimates, frame rates could improve between about 25% and 75% when adding a second GPU with a 12-megapixel, six-monitor array.
http://techreport.com/articles.x/18521/2
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post #23 of 23
Thread Starter 
Quote:
Originally Posted by tsm106 View Post
I found the tidbit on the limitation. You may be taxing your pcie lanes and/or the latency with the nf chips could be compounding things?



http://techreport.com/articles.x/18521/2
SLI doesn't have this problem. Seems to me AMD skimped not designing enough bandwidth for crossfire interconnects.
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