Hi, I've got a Mac Pro3,1 w/ a dual quad-core 3GHz and the GTX 285 1GB for Mac. Running El Cap. I use OS X for general use, but I game only in Windows 7. I'm wondering if it's worthwhile upgrading the GPU. The only Mac card I can get is the 7950 Mac Edition, but it's $1000 in Australia and $750-800 if I bought it from OWC and shipped it here. At that point I may as well be putting it towards a new iMac. I've heard you can get non-Apple cards working at the cost of seeing the boot screen but I don't think that's too bad. (I'd keep my 285, and my even older 8800 GT, safe in a box somewhere if I ever needed them.) Is there a card out there I can use which will be better than my 285 but reasonably affordable? Appreciate any input!