i have a 6200 TC and it runs vista aero with NO problem everything is fast EXCEPT for the flip 3d which is a bit slow when there are many windows open. now a 7300 GS can do better than a 6200 TC , which will make anything aero runs fast.
i had x800 XL (5.9 rating in aero) and i didn't notice a difference between a 6200 TC EXCEPT for the 3dflip... i don't use that option anyway , gimmick IMHO. i'm just trying to save the guy some money since he said it's for internet , music , video , you know the plain normal tasks.