Low GPU usage with crossfire BF3

[huey9055]

Hi guys,

I've been having dramas with my GPU usage in bf3. It only ever hits around 60 - 65% usage with vsync disabled on the highest settings. I've tried everything I can think of. My frame rates can dip to the 50's which I don't like as I bought these two cards for my 120hz monitor.

I've also tried different crossfire cables. All power connectors are connect and UPLS is disabled.

I play at 1920x1080 120HZ


First rig was:

i7 920 @ 4.0ghz cooled with 120 extreme ultra
asus p6t
gb DDR 3
7970 OC in crossfire
windows 7
850W silverstone PSU

I tried reinstalling drivers, formatting , all of those things ect but nothing worked.

I decided it may be my CPU so I built an entirely new rig which is

i5 3570k @ 4ghz
Asrock extreme 4 mobo
16gb DDR3 2133mhz
7970 OC in crossfire
silverstone 850W PSU

exactly the same issue happens with this rig. Disable UPLS ect, nothing works.

Because my GPU's were voltage locked (gigabyte) I sold both online and grabbed a pair of sapphire 7950's OC'd to 1175/1400 MHZ

The issue is still there for battlefield 3 with only around 60% gpu usage.
All of the cards have worked fine on their own at 99% but crossfire seems to cause issues.

Because I"ve tried two different sets of cards on two completly different rigs it leads me to believe its either just poorly optimized for ati cards in bf3 or a software issue.

I score 14,000 3d marks and everything else runs fine so I think it's optimization or crappy drivers.

Any ideas guys? I noticed another bloke has a thread on here with the exact same issue with no solution found. They suggested I make my own thread.

 

[Djentleman]

I see that no one helped you.
So here it is.
Your cpu is bottlenecking your system in battlefield.