Well if you look at just the specs on paper it alone it seems a 9600xt should be faster. They both have 4 pipelines, but the 9600xt has a higher core clock, which would give it more fillrate. Their memory bandwidth would be similar if you were comparing the 128 bit version of the 9800se. If you were comparing the 256 bit version, it would be considerably more than that of a 9600xt, but the 9800 se often isn't fast enough to make use of the extra bandwidth. If you look at benchmarks then the 9600xt is usually faster.