Do games run okay?
I would download and install GPU-Z and see what it says.
I would also, with afterburner running, run a game and check afterburner. You can set up afterburner to monitor various things, like :
"The Hardware Monitor shows you critical hardware information in real-time; temperature, usage, clock speed, and voltage. You can even display selected information on-screen while you game, so you can keep a close eye on key statistics."