The PSAT is (in my anecdotal opinion) much harder to "ace" than the SAT. NMSQT qualification was around ~215/240 for last year, that would definitely count as flying colors. I'd say anything over 205ish would be "acing" the PSAT.

I've met many highly-talented individuals who did really great on PSAT/ACT/etc, but none of whom could have achieved a 200+ on the PSAT without studying (for) the test extensively beforehand. In fact, I'd bet there isn't a single NMSQT scholar who didn't kill themselves in preparation for the PSAT.