I'm looking to upgrade the video card on my MacPro 3,1 (2008), but I am not sure exactly sure what my options are. From what I have found online so far, it looks like the safest bet is the ATI Radion HD 4870, which is quite old and expensive. Has anyone successfully used a non-mac-specific video card? Apple makes it sound like only the special video cards with Mac Firmware will work in the MacPros, but I can't believe that is necessarily true since everything is x86 these days. Are there any places I should visit that might have reviews or compatibility lists? For instance, work a hackintosh site perhaps show cards that do indeed work with Mac OS X? For context, I am currently using a single 30" monitor (dual link DVI) and running Mavericks. Thanks for any suggestions.