My friend has an 8600GT, I have an HD4650. Would he notice anything good if I replaced it (good meaning FPS gains). I've looked through so much junk, and the answer still eludes me.
The 4650 is faster than the 8600GT (assuming we are talking about the 512Mb DDR3 version). He should see a gain in frames, nothing major but surely noticeable.
Unfortunately the DDR2 really hurts the performance of the HD4650. The DDR3 version would be an alright upgrade but the DDR2 card, while still a bit better than the 8600GT, isn't much of one.
What if I OC'd it some? Possibly 650 on the core and 475 on the memory? I really want to do this for 'em, but if it won't amount to more than 5%, I won't bother.