gainclone in PC powersupply issue, pls advice

[erikb1971]

Dear experts

Iam starting to build my first gainclone amp (integrated dual mono). Iam still in the planningfase but it is already lots of fun. Now a friend of mine wants to start one as well. I would like that since we are both completely new to this, and two dumb***es now more than one, but there is one hang up for him. He would like to build his GC in his AV computer. But in there is very little if any room for the powersupply. So there are two possible solutions:

1. What is the smallest powersupply one could build that would be able to feed the gainclone?
2. Is it possible to use the computer's huge Powerunit? (The Corsair Professional HX650W).

Any advice would be higly appriciated.

PS. do not kill the messenger, I think he should just build the external powersupply, but I think his wife is against more boxes... gotta love them!