Recently found this forum, have a million questions. Been reading lots of different threads getting all kinds of answers to those million questions. Sme I haven't found. Have a 2009 Mac Pro. Recently flashed the firmware up to 5.1, in preparation for a CPU upgrade. Mines an 8 core, 2.26. Looking to upgrade to dual 3.33 (x5680's I believe). I have a Quadro 4000 Mac video card installed, and am getting ready to add a GTX 580. Naturally with the GTX 580, ill be adding a 2nd psu, in the 5.25 bay. And running both cards. My question is about power. My current cpu's draw 80w each. The upgraded 3.33's draw 130w each. When I add my 2nd PSU, which is designed to run 2 gpu cards, would it be a good idea to run both the Quadro, and the GTX off this psu (disconnecting the Quadro power from the macs motherboard), to make the load of jumping up from 80w CPU to 130w CPU? Does that make any sense, and would it be any help?