I'd like to see if I have bought the best card for my budget (≤ £200) for my 2008 Mac Pro 3,1. I've installed and am successfully running the 4GB version of the Gigabyte Nvidia Geforce GTX 960 which is an unflashed PC card so no boot screen. I will admit that I bought the card on the assumption that 4GB memory must be better than 2GB. I am aware that this model of mac is limited to PCIe 2.0 and that it may potentially throttle the performance of any card I install. The GTX 960 is definitely an improvement over my previously installed 5770, though I have to say the improvement was somewhat underwhelming. What I would like to do is benchmark my card and then compare the same values to other cards installed in the same model Mac Pro. So far I have not found any results from the setup I have. I want to know if a card with a Mac EFI (whether genuine or flashed) such as the the GTX 680 cards on eBay would give me better results than an unflashed PC card despite only have 2-3GB memory. If you can point me in the right direction(s) I'd be very grateful.