Funnily enough I was taking some old servers apart yesterday to see what PSU were in them, I haven't managed to figure out the wiring on them yet though as they are hot swappable PSU's
I've taken apart four different servers so far trying to do the same thing. So far I have a 100% failure rate but I have a PowerEdge 2950 coming out of service soon and I am hoping that will give me one win.