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using two PSU's

a rudimentary tutorial

a little more indepth info on dual or modular PSUs

cut and paste 101
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synch 2 PSU each as a seperate bus

1. Hardwired
2. With a relay

or employing a shared bus Like a redundant PSU

1. with resistors
2. with mosfets
3. with diodes (Single Source Fault Tolerant Power Systems)

(3 is slightly outdated now see gee's post > http://hardforum.com/showthread.php?t=776885)

I ran 2 hardwired 400 watts and a large RAID array for 3 years without issue on one of my boards (Abit KR7A)
however it may have been a contributing factor in the death of another board (ECS whatever :p )
though Im not at all sure about that

not running them synchd however certainly corrupted the hell out of the array :p
eventually switched to a Zippy Emacs MR3-6450P N+1
with considerably less total wattage but plenty for what was actually required
with 32A on the +12V rail for the drives and considering the mobo's VRM was powered off the +5V
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the relay option is covered more indepth as well
 
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