I've got an MSI NVIDIA GTX 970 Graphics Card (4GB, 1076MHz, 256 Bit, DDR5, HDMI, PCI-E) and would like to flash this to enable it for my old mac that I recently installed with Yosemite 10.10. I checked out Zeus (http://forums.macrumors.com/threads/release-zeus-flashing-tool.877437/) which looks promising! My question(s): Is it possible to flash the card via my mac (but at the moment I can't see anything as black screen) or use an external mac (as don't have a windows machine). For example, is it possible to boot the computer via an external mac through firewire and then do the flashing? The card has two 6 pins so they would be occupy all my slots. Ideas or advise? Thanks.