Don't mean to pose too many questions or deny the previous person help for his question; I've recently decided to give crossfire a try, and bought two xfx 270x cards, most specifically for BF4. However, upon installation there's little to no improvement in the games performance. I found this thread searching on how to properly set up crossfire and followed it as closely as possible.
http://img.photobucket.com/albums/v293/muirplayer57/bf41.png
As you can see in my screenshot here, neither card is running at 90%, let alone 80 or 70, and the frame rate is quite low I'd think. Lowering the resolution or quality only causes a drop in GPU usage percentage, and frame rate stays generally the same.
Some games or benchmarks do run both GPU's in the 90 percentage range consistently (far cry 3, unigine heaven).
My specs are as follows:
Mainboard: Asus M5A97 (old model, not le, r2.0, or le r2.0) AMD 970/SB950; xFire is x16/x4
CPU: FX-8350 @ stock speed
RAM: 16gb Patriot Sector 5 @ 1066
GPU: XFX Radeon R9 270x x2
PSU: Thermaltake ToughPower 750watt
I've disabled ULPS manually using regedit.
Power control settings for both cards are at 20%.
Only ideas I could come up with for this are that my mainboard needs an upgrade (a 990FX chipset), or a different power supply with a single rail due to the fact that the one I have now is a multi rail PSU with 18amps per rail. Or maybe both need to be updated?
Any help would be much appreciated.