Would they need load on all the outputs? I mean I have a dozen power supplies under the desk, many at 5v, 6v and 12v, so I would be drawing a couple of amps at those voltages. Don’t know if I would be drawing as much at 3.3v, but I would have to presume the supplies can handle low load at that voltage as older motherboards don’t use it at all.

Or are you just saying we would need to have the fan going?