My stock Windforce gtx 770 (came with oc) was getting a stable 975(ish) in Unigene Heaven, and I gave it a slight, non voltage oc up to about 1015 score and 1280 clock speed. After a few crashes I got it stable, but removed the oc and updated my bios. After this, my stock score want break 960, and overclock won't break 1000! I tried driver sweep, gpu reinstallation ect. I should also mention that my lower fps was raised, but average lowered. Is this normal? Could I have damaged my gpu? Thanks!!