Hi! I'm exploring dual GPU options for my 2010 Mac Pro (Currently a GTX 680 flashed running in it) The Radeon 7750 and 7770 will work out of the box, but just not enough power for me. Then there's the R9 270 and that won't run at all. The 270x runs, and one guy on Netkas even managed to make EFI for it. The problem is: the 270x is just barely over 150 Watts. I think it uses about 180 Watts and needs 2 x 6 pin. No dual GPU on internal power. So here's my idea: Modify a R9 270x BIOS to downclock it - yes, down clock - it two make it use less power so it can run from Slot and 1 x 6 pin. And here's my questions for you guys, before I do it: Is that possible? Do you think clocking it down to 270 speed will be enough? Will it still need BOTH Pins connected, so do I have to use one "dummy" 6 pin, or some kind 1 x 6 pin to 2 x 6 pin adapter? I you guys say it's possible in principle I WILL try to pull it of, buy the cards, flash them and post everything here. Dual 270x, even under clocked, would be very, very good for Pro Apps. So, what do you think?