I've been fighting with my 5870 now for a while. I had been having massive stuttering while gaming and sometimes would just outright stop displaying to a black/gray screen of death. Well XFX told me to RMA it and sent a replacement, yet its doing the exact same thing. I've tried everything I know to eliminate something else on my machine, but they are driving me nuts not wanting to replace their replacement. I've ran memtest with no errors and tried just 1 stick of ram and it still stutters and BSOD/GSOD's. I popped my 3870 back in and everything runs fine. Any idea what the heck is going on or is it just another bad card from XFX? Any help would be most appreciated. Thanks in advance.