If you wanted to overclock to 4.0GHz then you should perform below mentioned steps.
Code:
Ai Overclock Tuner = Manual
CPU Ratio Setting = 08.5
FSB Frequency = 472
PCI-E Frequency = 100
FSB Strap to Northbridge = Auto
DRAM Frequency = DDR2-945MHz
DRAM Timing Control = Manual
CAS# Latency = 5
RAS# to CAS# Delay = 5
RAS# PRE Time = 5
RAS# ACT Time = 18 (all sub-timings on Auto)
DRAM Static Read Control = Auto
DRAM Read Training = Auto
Mem. OC Charger = Auto
AI Transaction Booster = Auto
CPU Voltage = 1.31875
CPU GTL Reference = Auto
CPU PLL Voltage = Auto
FSB Termination Voltage = 1.26
DRAM Voltage = 1.90-2.00
NB Voltage = 1.26
SB Voltage = 1.10
PCI-E SATA Voltage = 1.50
Loadline Calibration = Enabled
CPU Spread Spectrum = Disabled
PCIE Spread Spectrum = Disabled
CPU Clock Skew = Auto
NB Clock Skew = Auto
CPU Margin Enhancement = Compatible
C1E Support = Disabled
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