6500 @ 1 ohm rated.
We were clamping ~7200 on the low 12s in Derrick's Explorer on the prototypes... our Russian guys clamped ~10k on a fairly weak 16v bank on the prototypes.
As they JUST came in Friday I don't have any production clamps yet -- but the guys in Russia got theirs a few weeks earlier and they tell me they turned out a wee bit stronger than the prototypes (which I expected).
One thing is for sure... they are VERY efficient... we did music testing in Derrick's explorer and the voltage drop at the same SPL was much less than with 3500s.