Could nVidia do/be doing this?

[Chris123234]

In 3DMark03, On the running tests, run at lower precision; but for the screenshots test thing run at full precision, in attempt to fool you into thinking the actual tests are being rendered correctly

 

[Humus]

I think that would be hard to implement, but I suppose it could be possible to do.

 

[Hyp-X]

You could draw the first 1-2 frames in a sequence with full precision, than turn to reduced precision on followup.
If you render a single frame this would give you full quality.