Hey there, i've been mining about a week on my old gaming rig which was a 5970, and i decided to get a new card and mine with that too, so i bought a 6990 and stuck that in the gaming machine. Trouble is my PC is now freezing all the time when i'm using it, and is basically unusable, even without running a mining program.
My PSU is only 850w and i think this might be the cause of the lock-ups. Anyone have any similar issues?
if you're mining with a properly configured mining program, your 5970 is pulling over 325 watts - and your 6990 over 400.
if you're using a gaming computer you've got a lot of stuff that's unnecessary, pulling a lot of other wattage (high-end CPU, lots of RAM, speakers, CD/DVD drive, etc.).
even a +90% efficient 850W PSU would probably be toast driving all that stuff.