Diamond HD 4770 Review
 

The 4770 was obviously designed to be a low-end card, and for this reason it doesn't compete with the GTX 285 behemoth from Nvidia - but it's not supposed to! What it does do is decode high definition video extremely well. For $120, you can get a video card that decodes video with almost no CPU usage whatsoever. I took a few hours to watch some of my favorite movies, and CPU usage was extraordinarily low. About 80% of the time, CPU usage was reported at 1%; occasionally this would get as high as 3%, but the most that I ever saw was 5%. What's even cooler is that the movies ran extremely smooth the whole time. If you're a movie lover, and you'll be building a multimedia PC, I'd definitely think about purchasing a 4770.

http://www.overclockersclub.com/reviews/diamond_4770/