I've been pleased with the stable overclock so far, so I haven't tweaked things further yet......but I might!!!
1 - For right now I've left my RAM (Memory Frequency) a little below spec after adjusting ther System Memory Multiplier; my RAM is 800MHz, but it's at 750 right now.
2 - Yes, I've disabled C1E and EIST; I hope this lent to the stability.
3 - With the voltage since taking it off Auto, I've had it at 1.25000V; I believe when I had it on Auto I got a crash/ reboot because (I believe) since I had raised the FSB to get my CPU speed to 3.0GHz, the CPU wasn't getting enough juice.
4 - I downloaded that Intel Burn-In Test program; I'll run it soon and tell you how it goes.
5 - Those other voltages you listed: NB, PLL & VTT. Perhaps it's different depending on what make/ model of motherboard, but I couldn't find those listing in my BIOS. The only one I sorta could find was the NB one (that's North Bridge, correct?). On my motherboard, it's listed as (G)MCH, and this is supposedly the voltage going to the North Bridge. Right now mine's on "Normal", but if I wanted to change it, the choices are from +0.1v to 0.3v. Should I leave that alone or bump it up?
Here's all the voltage choices in my BIOS with what I have it at and the choices in parentheses:
DDR2/ DDR3 OverVoltage Control: Normal (+01v to 0.7v)
PCI-E OverVoltage Control: Normal (+01v to 0.3v)
FSB OverVoltage Control: Normal (+01v to 0.3v)
(G)MCH OverVoltage Control: Normal (+01v to 0.3v)
CPU Voltage Control: 1.25000v (0.90000v to 2.00000v)
[Normal CPU Vcore: 1.25000v]
Let me know what you think,