Here are some pretty solid Q6600 settings for an Asus board
With an 8 multi though you will need to get 500 FSB, that board should do it
It should also have a .67 GTL option mine did not , I would use it, vtt at 1.4 is about as high as I would take it .... High vtt on those = death
CPU Ratio = 9
FSB Frequency = 440
PCI-E Frequency = 100
FSB Strap to North Bridge = 333
DRAM Frequency = 1069
DRAM Timing Control = Manual - 5-5-5-15
DRAM Static Read Control = Auto
DRAM Read Training = Auto
Memory OC Charger = Disabled
AI Clock Twister = Lighter
AI Transaction Booster = Manual - Performance 12
CPU Voltage = 1.595
CPU GTL Voltage Reference = .65x
CPU PLL Voltage = 1.60
FSB Termination Voltage = 1.40
DRAM voltage = 2.2
Northbridge Voltage = 1.50
Southbridge voltage = 1.20
PCI-E SATA voltage = Auto
Load Line Calibration = Enabled
CPU Spread Spectrum = Auto
PCI-E Spread Spectrum = Auto
CPU Clock Skew = Auto
NB Clock Skew = Auto
CPU Margin Enhancement = Optimized Mode
C1E = Disabled
Max Cupid Value Limit = Disabled
Intel Virtualization Mode = Enabled
CPUTM Function = Disabled
Execute Disable Bit = Enabled