Hi, I am considering upgrading the Radeon 5770 in my 2008 Mac Pro for a GTX 570. However, I want to still have the option to get an EFI boot screen without having to open up the Mac Pro every time. I was planning on putting the GTX 570 in the PCIe 16x slot where the Radeon is at the moment, and put the Radeon in a 4x slot (as its purpose will really just be to get a boot screen when it's needed). My question is how can both cards be powered. The GTX 570 needs two 6-pin power connectors, while the 5770 needs one. But AFAIK, the motherboard only has two ports, so I'm one short. Is it possible to power both cards? Thanks.