Re: Replacing my power supply
the "+12v rail" is the voltage rail that supplies power to the most demanding components including the processor, drives, cooling fans and graphics cards.
I think what your PSU is saying when it says MUST NOT EXCEED 160W is to make sure the components power needs does not exceed that. You should be fine getting one with more wattage than that, i don't see why you would have a problem because more is better usually.
Education: B.Sc IT
Certifications: CCNA:S, CCNA:R&S, CCENT, Linux+, LPIC-1, CLA, A+, Net+, Sec+, Project+, CIW:WF, CIW:WDS, CIW:JS, CIW:v5DBS