7950 overclocking

[65caliente]

Hi, I am attempting to overclock my gigabyte 7950's in crossfire (which I hear overclock like a beast). Every time I move the slider for the frequency up even a little bit I have stability problems and no game will play. I tried raising the voltage a little as well with no luck. so I have two questions:

1. Is it possible to overclock in crossfire mode and if so what am I doing wrong?

2. What is a surefire test to make sure a graphics card isn't faulty?

Thanks.

* I forgot to add that my PSU is a Corsair HX 1050 watt, CPU is a i5 2500k oc'd to 4.5 ghz, and mobo is an asrock prof fatality gen 3.

 

[alvine]

your two 7950's are too slow?

 

[williamjuly2003]

I really think you should just be happy with crossfire two 7950's I have read other threads where they can't even get crossfire to work let alone OC them.

 

[65caliente]

Well I'm waiting for my new parts to come in as my ram started to go bad randomly but I like to overclock just to try it out and heard that the 7950's were good at it. Anyways they were getting lower than normal FPS in the Just Cause 2 benchmark (dark tower) averaging only 40 fps which is much lower than 2 7950'd should have....

 

[Maximus_Delta]

Add voltage and check your temps are well under control. Report back after that.