This is by far one of the most popular power supplies and for good reason. If you are building a single graphics card AMD machine, there is no reason why you should need more capacity than the EA380 provides to power your build.
It runs quiet cooled by its 80mm fan and has certified +80% efficiency to keep your electricity bills low. If you are upgrading from a generic or old power supply it will pay for itself with the increased efficiency, especially if you are one of those who leaves their computers on 24/7.
Ive used the EA380 to power everything from ultra quiet media centre cube PCs to simple gaming machines, and Ive never had any failures. An AMD quad core, ATI 5850s two hard drives and DVD burner, no problem.
Crucially for gamers the 12V rail is split. This allows you to use one rail to power the processor , the other rail providing current for the graphics card and motherboard. Under a gaming load when both the processor and Graphics card are stressed this shares the load out evenly between multiple rails instead of one, therefore fluctuations in the draw are reduced. The multiple rails are also a boon for stability in normal systems as any blip in the powerline (the electricity grids fault) is less likely to result in your computer freezing.
This is essentially an enterprise grade server quality power supply. Designed to be stressed close to its upper limit for long periods of time. It is simple, dependable and cheap to run.