Low GPU usage on r9 280x CF!

[Juliogol]

Hi!

So as the title says, I am about to break my computer because of this issue

Recentrly I added a second r9 280x to my PC. Specs are

Asrock extreme4 Z77
Core I5 2500k @4.3 Ghz
12 MB ram
SSD 120 GB

Thing is that when I disable crossfire, I get around 80-120 FPS avg on Battlefield 4. Then when I enable crossfire, I get worst performance than with a single card, (50-90 FPS avg). The GPUs are working OK, because I´ve tested them separately.

Tried already

Disable ULPS
Tried with another motherboard
Fresh OS install
Connect two CF bridges

And nothing, I get bad performance, and from what I´ve googled, BF4 works great with crossfire.

Any ideas pleaaaaaaaaase

 

[Juliogol]

Only run one crossfire bridge, clean install of drivers?

Yeap... fresh OS install and only one bridge connected. Weir thing is that when I enable 144hz with only one bridge connected it gives me a blue screen. Have to set it at 120hz. But with the two bridges connected it gives me even worst performance

 

[Juliogol]

Is it just bf4 ? If so have you tried typing in console RenderDevice.FramePacingMethod 0

Ltmatt is your man for cf issues

Tried that too. No luck. And in all games I am getting low GPU usage when CF enabled. With one card I am around 90-100%, but when I enable CF i get 40-60% con each card. No matter the game settings.

 

[Juliogol]

Cpu bottleneck for sure. Had I5 2500k with xfire 7950s and also had what your experience in some demanding games.
I7 2600k sorted my low usage.

Really? At 4.3 Ghz? The I quit, selling both cards and get a r290 or a gtx 780.

 

[Juliogol]

Yep I had mine running at 4.5ghz battlefield and crisis 2 and 3 was the worst games I that bottlenecks.

Ufff... I thought it was enough with the 2500k...

 

[Juliogol]

Yep I had mine running at 4.5ghz battlefield and crisis 2 and 3 was the worst games I that bottlenecks.

Thanks for the help again. So when you use two GPUs it stresses the cpu more? That's why I am getting better performance with just one card?