Dragu
are you sure, you can rely on pcbench as a valid performance benchmark for gpu performance?
i know you can not 100% rely on passmark values (i think you can not rely on any benchmark-software, because every of them works different).
so the best would be, to do all different benchmarks out there and then you get at least a "feeling" or an approximately estimated value of performance.
but the very best would be, to compare the performance within the actual systems/games (dreamcast, 3ds, gamecube, ps2 etc.)