well i atually change the ram values to :
BIOS 0505
Extreme Tweaker
Ai Overclock Tuner : Manual
OC From CPU Level Up : AUTO
CPU Ratio Control : Manual
- Ratio CMOS Setting : 8
FSB Frequency :450
FSB Strap to North Bridge :AUTO
PCI-E Frequency: 120
DRAM Frequency: DDR2-900
DRAM Command Rate : 2T
DRAM Timing Control: Manual
CAS# Latency : 5
RAS# to CAS# Delay : 5
RAS# Precharge : 5
RAS# ActivateTime : 15
RAS# to RAS# Delay : auto
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 : STRONG
Transaction Booster : ENABLED (2)

CPU Voltage : 1.5v
CPU PLL Voltage : 1.6v
North Bridge Voltage : 1.49v
DRAM Voltage : 2.18v
FSB Termination Voltage : 1.4v
South Bridge Voltage : AUTO
Loadline Calibration : ENABLED
CPU GTL Reference : .63x
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 : 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

this is how my bios looks