Summary: I really wanted the 4GB of ram but should have known better than to get the blower style cooler. This thing sounds like a jet engine when its getting hot. The ability to OC this card is also poor. I know its luck of the draw but I had 2 of them and neither would do more than 100mhz. My Gigabyte 670s both ran faster than this 680 due to higher OC and were MUCH quieter and MUCH cooler.
Pros: Generally compatible with my early 2009 8 core mac.
Cons: NOT compatible with After Effects CS6. Adobe may at some point make an update to fix this, but no guarantee. Adobe tech support told me it would not work even dual booted in windows, though it will work on a regular windows computer. I have no personal knowledge of that, I'm just going to build a killer PC for Adobe. The widely known video card hack did not work either.