Having issues with Crossfire.

[PrimalTundra]

Hi guys,

 

Recently bought an additional HD7850 for my system to use in crossfire. Tested the card first and it works flawlessly by itself.

 

However, when I try to Crossfire the two, problems arise:

 

On booting any game, both cards are used to 30-50%, but after 20-30 seconds the 2nd GPU drops straight to 0% while the first is at 99%.

 

I have tried the following:

 

Swapping the cards around,

Turning the Crossfire cable around,

Reinstalling drivers (multiple times),

Enabled and Disabled Crossfire in Radeon Settings,

Trying different Crossfire profiles for all games tested.

 

Monitored using both Afterburner and GPU-Z, both show the same results.

 

Games tested:

Tomb Raider 2013,

Saints Row IV.

 

I've read that there may be some issues with Crossfire on AMD's Crimson drivers, hopefully they've addressed this by now.

 

Any help would be greatly appreciated.

 

[Syntaxvgm]

remove drivers, reinstall. Tended to fix it for me with 6xxx and 7xxx series. 

[tt2468]

Sounds like something is crashing. Try reinstalling your gpu drivers.

[QFA350]

Is the bridge seated properly?

[PrimalTundra]

I have tried reinstalling the drivers previously, but I'll give it another shot.

[PrimalTundra]

I have tried reinstalling the drivers previously, but I'll give it another shot.

 

No joy.

 

Even reinstalled Windows with no results.

 

Should have also stated in the first post that I have tried with Frame Pacing enabled and disabled, and Disabled ULPS in Afterburner.

Is the bridge seated properly?

Have also done this, still not working properly.

[PrimalTundra]

 

No joy.

 

Even reinstalled Windows with no results.

 

Should have also stated in the first post that I have tried with Frame Pacing enabled and disabled, and Disabled ULPS in Afterburner.

Have also done this, still not working properly.

 

Looks like I'll just be sending the new one back and getting a 7950 or 7970 for an additional £20.

 

I'm resigned to thinking this is a driver issue.