Well, the rule is: default resolution, that's why for those cards, IGP (82810, 82815, some Savage, Voodoo) we are now able to run 3DMark00 and 3DMark99 but not 3DMark01 according to the rules.
But the default settings rule is not applied to hardware/software D3D, T&L, Z-buffer and Texture compression, that's why it's allowed to bench 3DMark01 with ATI Rage and nVidia TNT2.