Here is my review of the Sapphire 7950 Mac Edition, MSI 7970 Afterburner, and the OEM Apple 5870. A little background info for you. I am a Certified Apple Technician and video card hobbyist. I am the rare Mac Gamer, and I prefer to use Apple hardware. Before 10.8.3 was running a 5870 and 5770 dual setup. Thanks to some generous return policies I decided to rack up my credit card and see what I could learn. And learn I did. Here is my system: Setting up the card was like any other, but as you can see there is NO built in plastic support piece for the card like the OEM Apple cards have I will talk more about that later. Now on with the gaming benchmarks. I am not a professional reviewer, so don’t expect some Anandtech type review. I tested in OSX and in Boot Camp, Windows 7. I included both numbers below. First some Bench Marks: StarCraft 2 – HOTS 2560 x 1600, all graphics maxed out GPU usage was 90+ percent 5870 (OSX) – 50fps 7950 (OSX) – 65fps 7970 (OSX) – 78fps 7970 (Win7) – 102fps 7950 (Win7) – Would not work with either BIOS Since a lot of people are interested in stress testing, I put these cards through the paces using FurMark in OSX and Windows. The windows version provide many more options to test with, but unfortunately the 7950 Mac was NOT compatible using either BIOS. But I included some OSX tests as well: Fur Mark OSX Basic “Windowed” test, 8x AA 7970 (Mac OSX) – 43fps 7950 (Mac OSX) – 35fps Fur Mark PC 1080P Burn In Test (OxMSAA) 7970 (Win 7) Min 47, Max 60, Avg 47 Burn In Score 4305 Finally, a lot of people were concerned that the 7970 was drawing too much power. When FurMarking above, I took some power readings from the computer. Here is what the wattage draw was on the ENTIRE SYSTEM: Max Power Usage – Fur Mark -Measured with Kill-A-Watt during stress testing. 7970 (Win 7) – 466w 7970 (Mac OS) – 380w 7950 (OSX) – 339w 5870 (OSX) – 339w Through meticulous isolation of various components I was able to determine that, in my system, at around 380w of total usage means my GPU is using about 225w. It's a lot of math that was detailed in a separate thread, but I feel it’s pretty accurate. That said, after further Windows stress testing I was able to actually push the system to use 466w! I am pretty sure the 7970 was using more than Apple recommends at that point. However, the machine was stable with all cards. I never had any issues after hours of testing. Furthermore, I continually measured the temperature of the logic board with an infrared laser, and it was at a consistent 85 degrees. There was no sign the board was struggling carrying that current and was not heating up at all. I felt safe running that power through the system. I feel like Steve Jobs, but there was one more thing… When I unboxed the 7950 Mac Addition I was greeted by this image: The image states that the MAC ADDITION must be directly connected to the power supply. It gives an image that has nothing to do with a Mac Pro. Obviously there is no way to do this on a 2010 Mac Pro. Furthermore, when you read the manual it REPEADEDLY STATES you “must connect the video card directly to your power supply”. Does it give you a cable to connect to your power supply? NO. It just gives you the 2 standard 6-pin cables. WTF? How is this power solution "Made for Mac Pro"? So after ALL THAT, I think I am returning my 7950 Mac Edition for these reasons: 1 – To switch to Windows, you must switch the BIOS switch or the card doesn’t work at all. And even if you switch the switch, the PC won’t recognize the card. Radeon drivers will have nothing to do with this card in Boot Camp with either BIOS. On the 7970 card, it worked either way flawlessly. The Apple cards work great in Boot Camp. Just not the 7950 Mac Edition 2 – The 7970 is just plain faster than the Mac 7950 in synthetic benchmarks, and in real life gaming. 3 – The 7970 is significantly less money. 4 – Neither card was really “designed” for the Mac Pro IMO. The 7950 just feels like a PC card. You know how the Apple 5870 and 5770 had that plastic piece extending out the back for support in the machine? That made sense. It was OEM, and it worked perfectly with the Mac Pro. This Sapphire card is not fitted for the Mac Pro any more than any other PC card. And the Sapphire officially requires a sloppy installation directly to the power supply. If you are really going to go through all of that why not just do the 7970? The only downside to the 7970 is that it's a power hog, but “officially” so is the 7950. Misc notes: *When you try and install the software from the CD in OSX with 10.8.3 installed it just says “you already have the latest drivers”. *With the Apple EFI BIOS enabled, the boot screen shows. And in “About my Mac” it shows “7950”. If you have the PC BIOS on, the mac just sees it as a “7xxx” card with no Apple logo at boot (makes sense). The 7970 also shows up as a “7xxx” card in OSX. *If you have an official EFI card installed and a standard PC BIOS card installed, the Mac automatically reverts to the EFI card for the boot screen. I thought that was kind of cool. If I switched to the PC BIOS, my 5770 would take over with the Apple logo. For that reason I still have the mac logo at startup with my 7970 installed. Thats it, thanks for reading along. At this point I think I am going to return the 7950 Mac Edition for the above reasons, but welcome any feedback. I wanted to love it, but its just not for me. Hopefully this helped the fellow Mac community. ***CORRECTION TO ORIGINAL REVIEW*** The 7950 Mac Addition's EFI BIOS is compatible with the PC side. The problem I was having was with the pre-exsisting Radeon software was not allowing the older Sapphire 7950 Mac drivers to install properly. The newer Windows drivers were basically overwriting Sapphires older drivers. To avoid this start with no Radeon Drivers in Windows and use the vendor supplied disc.