Hello everyone, I am hoping to get a little clarification. I current own an iMac 27 late 2013 but the performance is starting to bother me. I plan to buy a used Mac Pro 4,1 then flash the firmware to 5,1 so I can upgrade both CPU’s to 6 core Xeon x5650’s. I’m confident with most of the process, I have the PCI cards for USB 3 and a m.2 ahci adapter. Where I am a little less confident is the GPU. I’m aware not all can be flashed to see the boot screen. I had planned to use a r9 280x but from my research it looks like the maximum power draw you can get with the Mac Pro (without an external PSU) would be 225w. I’m concerned this card would go over that so I’m now looking at a gtx 1060 mini which should stay well within the power range. The 1060 cannot be flashed so I would lose the boot screen however does anyone know if I keep the old MP GPU in one of the PCI slots would I see the boot screen? Would OSX automatically use the 1060 once logged in? (I would have installed the drivers) My apologies if I come across ignorant, I hope someone can answer this. Much appreciated.