If you don't have a program that can measure your GPU usage, I recommend downloading EVGA Precision Tools, I think version 2 is the latest. It doesn't matter who manufactured your card, mine are Zotac and I can still use the tool. You can also use that to overclock your cards, monitor temperatures and set fan speeds. I recommend upping your fan speed, I don't trust the default profile to switch around. I leave it on 80%, which is inaudible in my room.