I've gone higher, but haven't ben able to bench higher, yet.

From memory:
All the chip stuff disabled (Speedstep,Virtualization, etc)
All Spectrum stuff disabled
Loadline Cal on

VCore: 1.6250
PLL: 1.62
VTT: 1.44
Mem: 2.34
NB: 1.48
SB: 1.55
1.2HT: 1.55
CPU_GTL +30
NB_GTL +30

DDRII Contr +30
Chan1 REF
Chan2 REF