Thank you for the answer. Also, will my AMD Athlon X2 3800+ with 3GB DDR2 RAM bottleneck HD 4670 a lot?
It will depend on the resolution, but the most likely answer is "yes, at least some." I agree with jsc about the PSU though; I would not trust Codegen. If the Corsair is not available to you, a 380W Antec Earthwatts would be another excellent choice.