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I have a 5850 and have recently returned a 5850 due to not be able to crossfire my eyefinity grouping. I was able to crossfire a single display, but my grouping disappeared the moment I enabled Xfire.
I bought the 5850 knowing I would most likely need another running a res of 5040 x 1050. I would NOT have setup eyefinity if crossfire wasn't possible, as most of you probably wouldn't.
I was reading this article and found what AMD admits interesting...
One of those improvements is the ability to combine CrossFire multi-GPU setups with multi-monitor Eyefinity display surfaces. The appeal here is obvious, since pushing 24 megapixels with a single 5870 GPU is possible and sometimes quite workable, but not for every game. Generating that many pixels at the right quality levels would tax any single graphics chip.
Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. 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 somewhatdon'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. ~ ref. http://www.techreport.com/articles.x/18521/2
I believe this bandwidth limitation was my problem. I believe AMD has tried correcting this since the 9.12 drivers, but in my case it was pretty fail having tried evrything up until 10.3.
I plan on buying a 5970, but only because I believe this is the only way to use a second GPU at this time with eyefinity. At least it is in my case.
My question is....Has anyone been able to crossfire an eyefinity grouping?
I bought the 5850 knowing I would most likely need another running a res of 5040 x 1050. I would NOT have setup eyefinity if crossfire wasn't possible, as most of you probably wouldn't.
I was reading this article and found what AMD admits interesting...
One of those improvements is the ability to combine CrossFire multi-GPU setups with multi-monitor Eyefinity display surfaces. The appeal here is obvious, since pushing 24 megapixels with a single 5870 GPU is possible and sometimes quite workable, but not for every game. Generating that many pixels at the right quality levels would tax any single graphics chip.
Making CrossFire work on this scale presents some challenges, however, as AMD readily admits. 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 somewhatdon'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. ~ ref. http://www.techreport.com/articles.x/18521/2
I believe this bandwidth limitation was my problem. I believe AMD has tried correcting this since the 9.12 drivers, but in my case it was pretty fail having tried evrything up until 10.3.
I plan on buying a 5970, but only because I believe this is the only way to use a second GPU at this time with eyefinity. At least it is in my case.
My question is....Has anyone been able to crossfire an eyefinity grouping?
