Summary: Not for mac, but it works fine on Mac Pro early 2008 (3,1), side by side with my old ATI RADEON HD 2600 XT (256mb). Two power cables (6to6pins) needed for use on mac (not included, cables included are different and not usable), purchased online for 10$.
Summary: We had a workstation here having issues running CAD and CATIA in that there was a delay in the graphics updating on screen. Those machines had a different brand of card in them and so we decided to try out the 600 series card.
Summary: Great card, no major issues. Runs smoothly, but only gave a 6.6 / 8 in the 'Windows Experiences Index' (i7 3770k, and an intel SSD w 32 gigs of CL9/1600 ram, a workhorse machine...) Only dislike, I have a monitor with HDMI In and integrated speakers. It runs 1920 x 1200, not the typical 1080p...
Summary: It's been a good purchase 2 weeks into ownership. I had upgraded an older CAD Workstation running Vista with an SSD drive and Windows 7. Unfortunately, the original ATI Fire GL card did not have updated drivers for Windows 7 and the drivers that came with Windows were horrible.
Summary: I picked this up yesterday to upgrade from ATI for 3D work. I have to say that this little card REALLY speeds up the viewport in my 3D application. It doesn't need a 2 power cables like my ATI card did, apparently only uses ~40 watts, and it's fan isn't loud so that's good.