I recently bought a Quadra 650 that was sold "as-is, no power". The machine appeared to be in great condition, but upon taking the ASTEC AA15830 installed in it apart, I saw that most of the film caps were cracked and/or crumbling and one of them looked burnt. I decided to take a stab at...
In general, yes, I do believe that 24v should work just fine. It will allow the VRM to run cooler in most circumstances. There are two downsides though:
The wattage consumed by things running on the higher voltage will not change. This will result in a larger amount of current flowing through...
I think it would also be cool to take something like this chassis mount PSU and make a 3D printed case for it for more of a stock look. That would be a lot more work, more expensive, and require mucking around with mains voltage... But it would be sexier than a plain black box.
I just found this PSU on DigiKey that should work great on a cube if you can make a cable (or are willing to harvest it from a stock PSU). It is rated for 240W and has enough connections to make hooking up the 4 wires easy. The voltage is slightly lower than stock at 27.6v, but I don't...