Undervolt MOBO settings

[Chi]

Q6600 Stock 9x266 2.4Ghz GO
ASUS Maximus Extreme
OCZ 2GB DDR3 PC3-14400C8 1800MHz (2x1GB) (OCZ3P18002GK)

At the moment everything is at stock, default BIOS settings...
What I want to do is Udervolt things so temperature etc are lower...

1)What all should I try undervolt? (all of them?)
This lot are all the voltages I think I should try to undervolt
CPU Voltage
CPU PLL Voltage
NB Voltage
Dram Voltage
FSB Termination Voltage
SB Voltage

An dont have a clue about this lot
DDR3 Channel A REF Voltage
DDR3 Channel B REF Voltage
DDR3 Controller REF Voltage
SB 1.5V Voltage
3.3V, 5V, 12V

2) Would anyone know what the lowest stable voltage is, Q6600 GO stock?
(Or there abouts since there not all the same etc)
On intel's website it says VID Voltage Range: 0.85V – 1.5V

3) When you set CPU Voltage to AUTO do different MOBO's use different voltages?
(Or is there a predefined list and it knows you stuck in a Q6600, so sets it to x.xxV, if so what is Stock voltage)

4) If I get CPU Volatge really low and CPU is stable, would that affect the outcome of like memtest on the RAM?
(Would memtest fail because CPU is not getting enough volts, I dought it)

 

[Tetras]

Stability testing with undervolts is exactly the same as stability test when overclocking, you can use Prime/Orthos/other favorite tool.

Undervolting the motherboard and memory is not something even worth trying (imo).

What are you trying to achieve with the undervolt? Q6600 automatically downclocks/undervolts when idle, if you just want to see how low it will go then try it, all CPUs are different, what is the lowest stable for one doesn't mean it will be others. I would suggest you start by checking your stock (not idle) VID with CoreTemp.