finally i ended my tests and i resulted to these settings for 24/7 usage..

BIOS 0901
Extreme Tweaker
Ai Overclock Tuner : Manual
OC From CPU Level Up : AUTO
CPU Ratio Control : Manual
- Ratio CMOS Setting : 9
FSB Frequency :400
FSB Strap to North Bridge :266
PCI-E Frequency: 103
DRAM Frequency: DDR2-1203
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 : 3
Row Refresh Cycle Time : 25
Write Recovery Time : 6
Read to Precharge Time : 3

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: Enabled
Ai Clock Twister : Moderate
Transaction Booster : AUTO

CPU Voltage : 1.4000v
CPU PLL Voltage : 1.52v
North Bridge Voltage : 1.45v
DRAM Voltage : 2.20v
FSB Termination Voltage : 1.4v
South Bridge Voltage : 1.05v
Loadline Calibration : ENABLED
CPU GTL Reference : AUTO
North Bridge GTL Reference : AUTO
DDR2 Channel A REF Voltage : AUTO
DDR2 Channel B REF Voltage : AUTO
DDR2 Controller REF Voltage : AUTO
SB 1.5V Voltage : 1.5v

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