I have a Q807 E8500 with Asus Rampage Formula and 4GB G Skill DDR2-1066.

Currently I am trying to push the E8500 to 4.2GHz with:

443MHz*9.5 with memory running DDR2-1064
Vcore=1.39V w/o Load Line Calibration (LLC) or 1.36V with LLC (Bios)
VTT (FSB Thermination Voltage) = 1.36 (Bios)
VPLL = 1.6V
NB = 1.61V

Everything are stable (benchmarks) but I am not too happy about the high NB voltage that leads to high NB temperature (~57 deg.).

Surprisingly, the most difficult part of OC'ing my system is to get stable windows boot up and restoring from hibernation. I use hibernation in day-to-day basis to cut down the Windows boot time (30 sec vs 5 min). I found that to get stable restore from hibernation, I need to have the above configuration (e.g. high NB voltage). (My test routine is 1) Restore/start my PC from hibernation 2) Run Super Pi 1M.) Without considering hibernation, I can drop every voltage by several notches and not affecting stability.

Another issue is Window boot up stability. I observed that sometimes my machine needs 2 boots to start with the first one crash right before the Windows desktop shows up.

Anyone has some insight about these symptoms? Does any one use hibernation?