When you get a power supply you need to look for 2 things, is it CE, UL, etc rated , and is the rating on the 5V and 3.x V lines ok for the system you are building. So,e supplies are rated 600W but only on the 12V line used for HDs etc and not so much on the lower voltages used for the CPU and video card. So a 650W supply might only be as good as a 450W supply from somebody else.

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