ASUS P5K Deluxe - Intel P35 Bearlake + E6600 B1 / Q6600 B3

[timber715]

at the moment, I'm at 3420Mhz with the following settings:
Q6600- L727A673-G0
Cooling Tuniq tower 120
Multi: 9
Fsb: 380
PCIE: 100
DRAM Freq: AUTO
DRAM command rate: Auto
DRAM timing: 5 5 5 15
Transaction Booster: enabled
Boost level: 1
CPU volt:1.375 ...pencil mod - cpuz:1.376
CPU Volt Reference: 0.63x
CPU volt damper: enabled
CPU PLL volt: 1.6
DRAM: 2.2 - 2x1 crucial 8500 in black slots
FSB termination volt: 1.40
NB voltage: 1.40
NB voltage reference: 0.67x
SB voltage: 1.05
others on auto...

Prime stable 8hrs with temps 37 to 67C...
and happy for now, BUT, i would like some insight on the following and what they are for before i raise my oc...

what does these do? and how to determine what to use???
CPU Volt Reference: 0.63x
CPU PLL volt: 1.6
FSB termination volt: 1.40
NB voltage: 1.40...suggestion for 3600Mhz and up that is safe
NB voltage reference: 0.67x
SB voltage: 1.05


any and all reply and suggestion welcome...