We can see that the DX9 PS2 performance of 5700 Ultra is significantly improved from 5600 Ultra, well beyond the clock speed increases in some cases. This would suggest that NVIDIA have done exactly as they did do with NV35 over NV30, and changed the integer units to smaller float ops that help out with common PS2 instructions (not that the simple PS2 test is only at difference over the 5600, which is their clock rate differences) - the difference being that this time the 52.16 drivers are better able to make use of this extra functionality, where the 44.03 drivers couldn't really show it with nv35 initially. Note, that the DX8 performance also stay inline with the clock rate increases.