No crossfire Improvement in any game

[mtb2008]

I have 2 radeon 4850s and cannot get crossfire to work. I have already uninstalled all the ati software and used driver sweeper and reinstalled. With reboots between every step and using safe mode for driver sweeper. I have also tried using 1/2 bridges and switching them in every way possible. Crossfire enables with no issues and will show the crossfire icon in games if i enable it. I have checked all the motherboard bios settings too and updated the bios.

Tried Battlefield bad company 2, Oblivion, Starcraft ii, Rift, Crysis 1 and 2 and call of duty modern warfare 2
They all get the exact same performance at 1920x1080.



I cant figure it out and am ready to sell the extra if it wont work.

MSI 870A-G54 Crossfire motherboard
2 Radeon 4850s 512 mb
4GB DDR3 Ram
600W PSU Coolermaster
Amd Phenom II X4 3.6GB

 

[bystander]

Can you post what GPU-Z says for each card?

If the 2nd card isn't working at x4 or better, you can't crossfire. It'll also let you know if it's enabled or not.

 

[mtb2008]

Let me know in the bios? Or in CCC. It shows it enabled in CCC and detects both cards. I can even overclock them. GPUz also detects them.

 

[bystander]

What bus interface do both have?

 

[bystander]

Oh, one more thing, do you play in Windowed mode? Or in Rift's case, even Windowed Fullscreen?

 

[mtb2008]

Pci-e 2.0 16x/4x

 

[mtb2008]

I only play in fullscreen.

 

[bystander]

16x/4x will cut down the benefits of crossfire a fair bit, but there should still be some improvement.

 

[bystander]

Rift and Starcraft II are very CPU intensive, those could be causing some cpu bottlenecks, but Crysis should definitely show some improvement. Have you use FRAPs or some other form of FPS reading?

You might also try running a benchmark, like 3dmark11. Sometimes you don't notice improvement because you didn't have bad FPS before.

One last thing, do you run Smart Doctor, Trixx or any other OC tool/graphics tool? Many of them are known to cause problem, especially when ran with CCC.

 

[mtb2008]

I have msi afterburner but it was installed to monitor gpu usage. It says that i use 0% gpu power on the second gpu. I have tested by removing the first and it works with a gpu in the second slot only fine. Im getting fraps now.

 

[bystander]

MSI afterburner, if you don't set any profiles doesn't normally cause a problem, but getting 0% usage on the 2nd GPU while in a game does show a problem. Normally that is only the case at the desktop, or Rifts windowed fullscreen (looks like fullscreen, but functions like windowed).

 

[wolfram23]

Hey just curious, have you installed the lastest CAP along with the drivers?

 

[mtb2008]

Application profiles are installed

 

[wolfram23]

Have you tried a different crossfire bridge? I know you said you tried 1 and 2, but did you do 1 at a time with both bridges?

If nothing works I almost have to think the motherboard is having issues with it.