I think I may have hit the wall with my OC on my Q6600 G0.

I have the following:

FSB: 400
DRAM FREQ: 1066 Mhz
Timing: 5-5-5-15 (2GB DOMINATORS)

Vcore: 1.475 (shows up as 1.175 in CPU-Z, is droop really this dramatic??)
FSB Term Voltage: 1.30
DRAM voltage: 2.15 V
NB Voltage: AUTO

I don't really know what FSB termination voltage is, does increasing it help any?
Is the CPU-Z voltage correct ? Would higher voltages be worth a try?

Any suggestions to push to my goal of 425 FSB would be helpful.