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: Used it on my Dell XPS 210 when I upgraded it to the max. It improved my AutoCAD and other video performance well beyond my expectations. Decent performer for gaming also, but it's not an Alienware