mosfet model spice/pspice

I am simulating a discrete mos device in Spectre.

If I treat it as a spice model the drain-source current is much too low (mA vs amps expected). If I treat it as a pspice model it is good. The model is not supposed to Pspice specific and works OK in other simulators.

Any ideas what might be going on?

.MODEL PMOS PMOS LEVEL = 3 U0 = 400 VMAX = 1E+006 ETA = 0.001
+ TOX = 6E-008 NSUB = 1E+016 KP = 26.45 KAPPA = 19.32 VTO = -0.6929