Retail Pc Blasphmey

[Durrthock]

Well I'm thinking of buying a retail pc because I found a really good one. Well priced. The only problem I have is that Idk jack about psu power How do I figure the combined 12v rating?

[Redundant]

Wait, can you rephrase that?
Why would you need to know the PSU rating if the PC is already made?
*confusion follows*

What kind of PC is it anyway as you can probably build one for a good price too plus it would be more upgradeable.