i am running on Windows XP,with a Nvida card,g-force4 MX 420 with 64 MB,runs good on RF2...but then again,i didnt run RF2 on XP,and havent done so...only on Windows 98.I am going to check alll the gooda to see if i have the allowable amount of RAM(not video RAM),i should have a good enough card,just seems to be hesitant at times,and not smooth like it should....The prop spins,but you cannot see it rotating..even with throttle,the sceneary...well,i cant see that big of difference...the only big things i see is the shadows on the plane glimmer,the plane behaves alot better than RF2 when you have the "see ground mode" on at all times....should be good for IMAC...the planes also behave a little more realistic,more softer than RF2...also,when changing planes or airports or anything...it takes alot longer than RF2...I hope i can weed out the problems...what is the video card of choice nowa days???Mine is about 2 or 3 years old.