Gigabyte GV-R685OC-1GD Major Lag

Hello All

so here is the situation I have a gigabyte GV-R685OC-1GD gpu which for some reason is extremely laggy playing games like second life and need for speed world and so on. I have all the latest drivers from ati and the card seems to be fine and is running a factory set overclock. Temps seem to be fine running about 32c. Now i just took it out of my rig and hooked up the onboard intel hd graphics and tried the same games and had absolutely no lag whatsoever. Any idea what the issue may be? Below are my system, specs

Asus p8z68-lx motherboard
intel i5 2500k running at 3.3ghz
16gb kingston hyper x ddr3 memory
ocz 120gb ssd drive with 1tb wd blue backup drive
corsair tx750 psu
corsair h60 liquid cooling running push pull temps average around 26c on idle 52c on full load
coolermaster haf932 case
and of course the GV-R685OC-1GD video card