Pros: It works and fits perfectly in a 2008 Mac Pro.

Cons: None

Overall Review: While it's not a con, I wish it were made of aluminum or another metal to match the archaic HDDs I still have as well as the aluminum chassis.

Pros: Amazing specs compared to the 5770. Just as quiet as the 5770 when idle. In a 2008 Mac Pro, Unigine and OpenGL benchmarks put OS X graphics performance at over 2x as fast as my outgoing 5770. Under Windows 8, Resident Evil 5+6, Unigine,and 3DMark benchmarks put DX9 performance at 2x-3x better, DX10 is 1.5x-2x better, and DX11 is 2.6x better. Real world testing with programs that use OpenGL, OpenCL, DirectX, DirectCompute all show noticeable improvements. Games such as SimCity, WoW, and Diablo 3 show the most dramatic improvements while programs like Aperture, FCP X, Motion, Premiere Pro, and Photoshop CS6 show more modest, if barely noticeable (a few seconds or FPS), gains.

Cons: Expensive It does get a bit louder than idle, but not much louder than my outgoing 5770. It's limited to PCIe 2.0 until Apple can release a Mac Pro with updated PCIe slots.

Overall Review: This card has brought new life to my aged Mac Pro. $479 is a bit steep for a card that's no better than a reference model, but well worth it in extending the usefulness out of my Mac. Sure improvements vary from program to program, but overall still a worthwhile improvement for me.