New graphics card running game video to fast

I know this sounds weird, but I just bought a new Asus HD 6670 and a new Lepa N 500 power supply to run it on my Asus computer, since my old card went to that giant junk heap in the sky. It works fantastic...a little -to- fantastic. While playing games my video moves like an old sped up talkie from the golden era of movies. Everything moves comically fast, making it practically impossible to strike anything on my FPS'. Is there any way to slow this down? I jacked everything up on the video for Mass Effect 2, and while it looks gorgeous, it's still an issue. Any ideas?