It is still an upgrade from my old XFX 7900 GS. Stock: core 675/shaders 1500/memory 900 I used EVGA Precision and gradually increased Core and Shaders to 750/1666 and ran Furmark for about 20 mins. Card only got to 83c temp and no artifacts...I reset these to default and started tweaking the memory. I bumped memory to 1000 and had similar resuts, but when I put it to 1100 the desktop glitched out! Am I expecting too much with the memory? I read somewhere that the effective memory was 1800. Does this mean when I bumped it up to 1100 the effective memory went to 2200? I have been "out of the loop" for a while...What is PhysX?