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Need help with Crossfire & eyefinity!

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Poogobbler

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May 1, 2011
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To make this simple, I am getting terrible/unplayable performance when running my 2 HD5830's in Crossfire & 3 monitor Eyefinity (6024 x1080 bezel comp on) compared to just running 1 HD5830. The strange thing is, when I turn OFF Crossfire in the CCC and play BC2, I can almost max out the settings and play smoothly. Before I got my second HD5830 installed I could NOT that. If I go back to the CCC and enable Crossfire and try to play BC2 again, it loads servers very slowly and once in game its nearly unplayable with strange blocky pixelations in the menu and in game with sub 15 fps. I HAVE tried both cards by themselves and they both function normally.

I have an older 640W Antec PSU with 2 PCIe 6 pin which I use in the master GPU and the other GPU is using convertors off 4 Molex which have read is totally do-able. I have the latest ATI drivers and everything in CCC is set to default. I've tired older drivers with the same problems.

Question: Its this characteristic of a old PSU?
 
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