Its probably because the engine or game has scalability features sort of like the source engine, but probably on a more limited scale. So you might not get as many neat effects as someone who has a nie dx9 card. And thus its faster, but you aren't running the same game as someone with a higher tech card. I good example is that I could play Doom3 with a GF2 moderately fast, but it basically looked like a messed up high poly glQuake. I could run Doom3 with my Radeon9800pro at almost same speeds (a bit faster maybe), but it looked absolutely amazing and had all the advanced features on.
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