You just cant compare these like that. I mean ur taking a high end card and comparing it to another high end card and comparing that to a low end card in the same gen as the 2nd high end card. I mean they take severely crippled chips, cripple them more, and turn them into 5200's. Their best output of the GF2's would probably match up well to that chip. The thing with the recent 9x and FX series of graphics cards, is that they have a HUGE range. You just cant compare then and now like that considering this.
(Note: This may not make total sense, but i think u may bet the idea)