I'm considering getting a second GPU for my system. The GPU I have now has been flashed to get a boot screen. I would suspect that the second GPU wouldn't need to be flashed since it would not be running my monitors. Does anyone know if I'm correct? My system: 2010 5,1 Mac Pro 3.46GHz 12-core Radeon R9 280X (running two monitors) OSX 10.9.4 I would be using the dual GPUs for After Effects, Premiere Pro, and Media Encoder. I already know that I will need an external power supply for this config.