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Delete Please.

the mini ITX mb's take 20 pins to power them and a PS only has one 20 pin cable.

So I would say no you can't do that.
 
With a little work, you could probably get them all wired to one power supply, but being able to power them on and off independently will require quite a bit of work due to the way the computer tells the power supply to turn on/off.
 
You'd need to make a splitter for the 20 line cable. Then figure out how to handle the signals between the MB and PSU that says "power stable". The splitter can have a set of switches, one per output, to power individual MBs. The trick is to decide which lines can be active all the time (certainly the standby power and all grounds) and only switch the others. Otherwise, finding a single-throw, 18 pole switch will be tricky (but not impossible - a ganged switch is what you'd need). The one thing I'm not certain of is how the PSU differs in its initial power up (for a single MB) versus being fully powered up and having the power switched suddenly for one of several MBs. There might be no significant difference - any power-up variations may be entirely handled by the "power stable" signal plus the MB's power handling for the CPU etc.

I've been thinking of the same thing. Well, daydreaming, really cause I don't have the money right now, just a spare PSU and ideas.
 
Thats really risky because of how you would have to turn all of them on at the same time. :(
 
I just don't think it can be done by a individual. PS manufacturers could maybe do it but doing this at home will probably result in 1 nothing, 2 fire, 3 fried boards or 4 end of world.

They do make a PS with both a 20 pin and 24 pin cables wonder if someone has tried to use both at the same time.
 
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