If it's an AGOIA, you can get a good 1830MHz out of it at 1.85v.
If you're running at 140 x 12.5, that's still 1750, which is approximately Athlon XP 2100/2200 speeds.
On my old KX7-333R, my 1600 got up to 1830 at 1.85v, and many got similar clocks on boards that could handle it.
I think 1750 could be done on 1.75v.