I just had to turn up the 'go faster' knob...new speed:

User Name: AndyM
Stability: Orthos 11+ hours

CPU name: E6600
OC: 3.7 GHz
Stepping: 6 B2
Week: L627
Code: B155
Vcore: 1.4375 (bios) 1.40 (Vdroop)

Cooling: Water
Cooler brand/model: D-Tek Fuzion

Motherboard: Bad Axe 2
Bios Version: 2507
Operating System: XP 32

RAM brand: Corsair
RAM rated speed: PC6400
RAM actual speed: 824DDR2
Latency: 4-4-4-12