I got a new comp for Christmas, a Compaq P4 1.7GHz 512mb SDRam, GForce 2 MX. I was wondering, which would be better, to upgrade to a RDram mobo, or to replace my GPU with like a Raedon 7500 / 8500 / Geforce 4 Ti 4200? Also, is a Raedon 7500 comparable to like one of the better Gforce 2's or what?