Thanks for the reply.
I'm planning to use a linear supply (it's an Astron RS-50A), and I think it will hold 12 VDC pretty well. The only thing I'm not sure about right now is the current... It can do 37A continuously or 50A in short bursts (50% duty over 10 minutes). If I understand the information on the S1 I've seen so far, 30A should be enough, right? I'm just wondering if the lower voltage will let me get a higher continuous current for overclocking...
Overclocked S1 (200gh) draws 15-16 amps per blade or 31-31 amps total at 12Vdc