Originally Posted by Kev1
My vote for the 5700 Ultra out of those 2 cards
If you could a 6600 or 6600GT would work great in your system too. Can get 6600GT AGP cards for around $150-$160 now at NewEgg.
I think he already has both cards but was just curious if the 5700U would be much faster than the 4600. But yes, if he does have both (even with his system that is a bottleneck) I'd use the 5700U.