3x7950 is using about 1.6GB.
That might be the case.. but cgminer will not start with 2Gigs...and thread concurrency above 8192
-5 Error...
I just found one of my miners who has this error. looked in the system proprieties, and there is 2 out of 4 gigs usable... I have not idea why...but i cannot start that miner anymore