we run 3 on a 450W PSU. For six a 650W PSU should be fine. But don't put a 125W AMD CPU on that mainboard, if possible.
Christian
"we"

(Yes I have been lurking, only reading Christians posts lol)
I've been joining or forming various allegiances for different mining projects. :-)
in this case it's the two rigs with 3 gtx 750Ti that I've set up for a good friend. I am
administering these remotely, he gets the coins.