Summary: I bought this as a second card in my desktop. I've had a 5770 for a while and decided to get another for another monitor when I needed it and crossfire for when I didn't need the third monitor. Its been about 4 years since I bought my first and about a year since the second. I recently played Bioshock Infinite on medium and it ran extreamly well, and with the graphics all the way up it would run great till a battle broke out.
Summary: I purchased this card in the hope that I could crossfire link it with its twin that was already residing in my Mac Pro Server. Unfortunately, I later discovered that like with just about every card-slot upgrade one can get for this machine, you need to be running Windows in order to unlock its full capability - meaning that crossfire is only supported in Windows in this specific case. Having two video cards in this system will allow the use of up to six monitors though.
Summary: I was going to have to buy a new computer because my old one was "vintage" yeah not cool. but it's working great with this installed! Only issue I had with it was, it didn't fit in all the way no matter what I tried. it still works!
Great upgrade from stock card but for my flight simulator more is needed!!
2 May 2012
Summary: Purchased the card specifically for my Mac Pro Desktop to run Xplane flight simulators and up to 4 monitors. Much better then my stock graphics card (can run more options) but still can't run max options like I want without it bogging down or slowing the frame rate . I don't believe this was as good as I could have gotten.
Summary: I purchased a secondhand 2006 Mac Pro with a 30" monitor that originally had only 256mb of vram. Some of the most recent programs such as Autocad 2012 for Mac and Rhino 5 were noticeably laggy when I first ran them, which prompted me to upgrade its video card with the one here. After installing It, I noticed SIGNIFICANT performance increases which made me quite happy about my purchase!
Summary: I was completely happy with this card in my machine, i could max out settings on almost all games such as LFD2, Dragon Age, Dirt, etc.. I had a great experience with this card and so will you. Very overclockable if you replace the thermal paste and have proper cooling in your tower.
Summary: I bought this primarily so I could add the new 27" apple cinema display as a 3rd display to my 2008 (3.1) mac pro. My other graphics card is the nvidia GeForce 8800GT which is powering two 19" monitors over dvi. It works fine- no compatibility issues with the nvidia. I'm running Snow Leopard 10.6.5. I think there was also a software update available for the card after I installed it.
Summary: I too own a 2008 Mac Pro and replaced my aging Radeon 2600 with this puppy. First thing I noticed out of the box: it is HUGE compared to ATI and NVidia's older GPUs from a couple years ago. To the tune of 2x as wide and 2.5x as long. It also requires that you plug it into one of the 6 pin power adapters on your motherboard, which isn't hard but if you're not used to doing stuff like that it might be a little scary at first.