Agreed with above, Raidmax is the PSU supplier you generally shy away from. Rosewill isn't on the short list of "most reliable PSUs" either.
Don't get hung up on the total wattage of a PSU. You are concerned with the "+12V" rail(s). Notice the 20 amp 12V+ rail on the Raidmax? That is just over half of the total power output of the unit (240 watts). Not a good thing.
Rosewill, 30 amps on the 12V+, but no PFC, and it is only ~65% efficient.
The Coolermaster is better, but misleading. Technically, you should be able to pull 36 amps combined from the 12V+ rails (18+18), but in reality it only supplies 324 watts total on the 12V rail or 27 amps total. Not great considering it only has slightly above 70% efficiency and no PFC.
My choice for a cheap PSU: http://www.newegg.com/Product/Product.aspx...N82E16817139008http://www.hardwaresecrets.com/article/750/1
While technically rated at 400 watts, look at the 12V rail, 30 amps. It is also 80+ certified.
Best places for PSU reviews: JonnyGuru, Hardware Secrets, HardOCP.
Edited by dpunisher, 17 April 2010 - 03:45 PM.
I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)
3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)