a 500w psu wouldnt be enough then?I alreadyhave one from my current computerA decent 550w would be enough. Not a cheap one.
i5 3570,h61m ds2 motherboard with 1 120 gb ssd 1 500gb hdd and 2x4 ddr3 ramsThe voltage on the rails doesn't really say much, indeed.
It would help more to know the rest of your system's specs. 500 watts sounds enough, but there are some PSUs that don't make as much as they say they do (or they can't maintain the 500W load sustained).
Providing a list of parts with brand and model names would help out more.
i5 3570,h61m ds2 motherboard with 1 120 gb ssd 1 500gb hdd and 2x4 ddr3 rams