OK. Its only rated for 324W at 12V. It fails to deliver its rated power, and lies on the label which is typically. But at least its not an extreme and shut down instead of blowing up. http://www.hardwaresecrets.com/article/Cooler-Master-Elite-Power-460-W-Power-Supply-Review/1005/9
That being said it should handle an X3 and 6770.
however the 7750 is the same price, with similar performance and lower power. 6770 might be a tiny bit faster. Probably a toss up.
5770 in skyrim (its the same as a 6770). there's some benches of the 7750 in skyrim in the 7750 review. http://www.tomshardware.com/reviews/skyrim-performance-benchmark,3074-6.html
A triple core 3.5 should be playable at ultra and you can always turn the detail down a little or go for a light overclock. http://www.tomshardware.com/reviews/skyrim-performance-benchmark,3074-9.html
I think you'd want both the CPU and GPU.