So I installed a 2GB GTX 960 in my Mac Pro 3,1. I know it's not a high end card or anything but I figured if I upgraded the GPU in this machine it might make it still usable coming from a GTX 8800. I'm using the Nvidia web drivers of course and I even heard that using the latest drivers hurt performance big time on macOS 10.13.3 so I used a 3rd party installer that patched the driver 322.214.171.124.25.106 to work on High Sierra 13.3. All seemed well until I tried doing anything graphics intensive and realized my performance was no better if not worse in Final Cut Pro X, in gaming it seems better but certainly not to the extent I would expect a 960 to perform at. I read something about how non-flashed cards don't interface with the Mac Pro 3,1 through the highest bandwidth the PCI slot can handle? Could this be causing my issue? I have it in slot 2 16X. If flashing the card would improve performance could somebody show me where you find compatible cards for flashing for Macs? This one is an EVGA SuperClocked GeForce GTX 960 with 2GB GDDR5.