Thanks, been there, was at 20X200, but I worked the other way around - took V up at 0.005 increments from 1.450v and ended up at 1.480v with the same results. Ended up increasing my CPU Northbridge V as well an the frequency from 2000 to 2600 (in increments) - requires a lot of patients and reboots. :) - ended up leaving it at 3.9GHz after 2 weeks.

