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Question: Is this still the best card to get for a 2013 (i.e. last of the towers) Mac Pro, for someone who plays games both in OSX and Windows?
Document: I was hesitant to buy this card, since it says it requires a Mac Pro 4,1 or 5,1 but I'm glad I did. I pulled out my trusty Radeon 5870 and popped this 7950 into my Mac Pro 3,1. I had no issues setting it up in OS 10.9, 10.6 and Windows 7. I was very pleased to see that frame rates went through the roof in my favorite (full screen HD) games.
After installing the card, I got no improvement in performance - until I turned the settings of the test programs and games up to maximum! I'm now able to use the highest settings for all my games, both in MacOS and Windows, with no difficulties and great performance! Easy enough to install, my only regret is that it is so small that it does not lock in place like previous cards.
New life for my late 2010 Mac Pro! I installed this card nearly a year ago and it has worked continuously since then, day in, day out. OS X Mountain Lion recognized it right away, never had to load a driver. When I upgraded to Mavericks, again, no problem.
I am now back to using my under-powered stock Nvidia card. After initially working well, albeit with a significant increase in noise at start up and under load, this card developed intermittent problems. The screen just went black. Then one day it failed to stopped working at all. Was a nice boost in graphics in games while it lasted. Very expensive for something with reliability issues.
I have a dual-quad 2.26ghz Mac Pro and was using it with the 4870 card from Apple. It's a great box, even as it's approaching 4 years since I bought it, but the video capabilities of the 4870 were showing their age BADLY.Like many Mac Pro users, we're on pins and needles waiting for Apple's newest system.
I purchased this product because it was one of the few video card options I had to upgrade my Mac Pro (mid-2012). The card is a little expensive for what it is, but when you need something Mac compatible you pay the price. I currently use this card primarily for video editing and graphics creation and it has given me a good boost in performance. I would recommend this to anyone working with Premiere, FCPX, or After Effects who wants a bump in their Mac Pro's performance.
Other than failing to provide access to any of the promised OpenGL 4.x functionality, this card seems to be working fine in my 2009 Mac Pro (4,1).I'm sure the fault for not supporting this card properly under Mavericks lies entirely with Apple - but if the vendor knows that it isn't possible to use advanced hardware features (like tessellation shaders) they shouldn't advertise GL version 4.2 support.Update:  My bad - found the answer on stackOverflow website (A.Coleman).
I installed this in my MacPro 2009. Easy installation, great performance boost over my 5770 and of course over the original Nvidia GT120. If you don't toggle the little switch (PC/Mac) to Mac, it still works fine, you just don't see the gray boot screen with the Apple logo. Toggle the switch and all is well.
As I only have 1 screen that has a display port on it & it doesn't like to work all of the time I have nothing to connect without an adapter to the Mini display port connectors without an adapter. So 3 is possible & 3 that is in general larger than 1920 X 1200.Try it you'll like it. I'd recommend Mac OS 10.9.1  as another has said as this worked best.
Doesn't work good with final cut pro, motion 5, Photo shop, After effect all in mac, a small scratches comes on the screen but its fast rendering
Answer: Yeah it's very good for games though. You will be fine with this card