Just for grins, I loaded the "Fast" write combining video driver from Omni into an OS42 system under VBox.
NXBench reports NXFactor of 151 with vs. 159 without.
Processor feature doesn't seem to be supported (not surprising).
Don't bother unless you're on a real PentiumPro or PentiumII. I haven't checked under qemu, but I bet it's the same story.