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Need help with Crossfire & eyefinity!

P

Poogobbler

n00b
Joined
May 1, 2011
Messages
8
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 it plays quite smoothly. Before I got my second HD5830 installed, I could only do about medium settings which tells me something is working somewhat right because of the performance increase. Even more strange, 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've tried using 1&2 Crossfire bridges with no difference and tried both cards by themselves and they function normally.

I have an older 640W Antec PSU with 2 PCIe x16 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(11.4) and everything in CCC is set to default. I've tired older drivers with the same problems. I am considering getting a new 850W PSU with 4x PCIe x16 power connections because I'm running out of ideas. Which brings me to my question...

Question: Its this characteristic of a old PSU not supplying enough power or would yall say its something else?? Any help would be much appreciated.
 
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I noticed slightly less playability going from 1 6950 to two of them, 1 card just felt way smoother in most games. I ultimately sold one.
 
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