Perhaps it helps someone for his OC. My settings for 500x7 with E6750 and 1200Mhz with Transcend axeRam 1200:

BIOS 802
Extreme Tweaker
Ai Overclock Tuner : Manual
OC From CPU Level Up : Auto
CPU Ratio Control : Manual
-Ratio CMOS Setting : 7
FSB Frequency : 500
FSB Strap to North Bridge : 333
PCI-E Frequency: 100

DRAM Frequency: 1200
DRAM Command Rate : 2T
DRAM Timing Control: Manual
CAS# Latency : 5
RAS# to CAS# Delay : 5
RAS# Precharge : 5
RAS# ActivateTime : 5
RAS# to RAS# Delay : 15
Row Refresh Cycle Time : Auto
Write Recovery Time : Auto
Read to Precharge Time : Auto

Read to Write Delay (S/D) : Auto
Write to Read Delay (S) : Auto
Write to Read Delay (D) : Auto
Read to Read Delay (S) : Auto
Read to Read Delay (D) : Auto
Write to Write Delay (S) : Auto
Write to Write Delay (D) : Auto
DRAM Static Read Control: Disabled
Ai Clock Twister : Moderate
Transaction Booster : Disabled
-Relax Level 1

CPU Voltage : 1.32500
CPU PLL Voltage : Auto
North Bridge Voltage : 1.29
DRAM Voltage : 2.14
FSB Termination Voltage : 1.36
South Bridge Voltage : 1.050
Loadline Calibration : Enabled
CPU GTL Reference : 0.63x
North Bridge GTL Reference : 0.67x
DDR2 Channel A REF Voltage : Auto
DDR2 Channel B REF Voltage : Auto
DDR2 Controller REF Voltage : DDR2-REFF
SB 1.5V Voltage : Auto

NB LED Selection : NB Volt
SB LED Selection : SB Volt
CPU LED Selection : CPU Volt
Voltiminder LED : Enabled

CPU Spread Spectrum : Disabled
PCIE Spread Spectrum : Disabled