hi. i am new to the forum although i have been reading it for many months now. a great forum and thanks to all for all the information which has helped me enormously. however i am unable to get a little bit further. i am wanting to reach 4.0ghz for 24/7 use. i have been prime blend and small fft stable for 12+ hours with auto settings, but i am wanting to set manually. i do want the settings to be safe for 24/7 use. i always fail the blend test. small fft seems to be ok, so i assume it is my fsb which is holding me back. increasing vcore beyond below value has been of no real benefit in stabilising my o/c.

please read full specs in sig.

with the bios settings below i have manages to stay 2.5 - 3hrs blend stable before failing.

AI Overclock tuner: Manual
CPU Ratio Setting: 8.5
FSB Strap to North Bridge: auto
FSB Frequency: 470
PCI-E Frequency: 101
DRAM Frequency: 940
DRAM CLK Skew on Channel A1: AUTO
DRAM CLK Skew on Channel A2: AUTO
DRAM CLK Skew on Channel B1: AUTO
DRAM CLK Skew on Channel B2: AUTO
DRAM Timing Control: Manual

1st Information :

CAS# Latency: 5
DRAM RAS# to CAS# Delay: 5
DRAM RAS# Precharge: 5
DRAM RAS# Activate to Precharge: 15
RAS# to RAS# Delay : AUTO
Row Refresh Cycle Time: auto
Write Recovery Time: AUTO
Read to Precharge Time: AUTO

2nd Information :

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

3rd Information :

WRITE to PRE Delay: AUTO
READ to PRE Delay: AUTO
PRE to PRE Delay: AUTO
ALL PRE to ACT Delay: AUTO
ALL PRE to REF Delay: AUTO
DRAM Static Read Control:off
DRAM Read Training: off
MEM. OC Charger: on
AI Clock Twister: lighter
AI Transaction Booster: auto

CPU Voltage: 1.2750
CPU GTL Voltage Reference (0/2): .635
CPU GTL Voltage Reference (1/3): .670
CPU PLL Voltage: 1.54
FSB Termination Voltage: 1.28
DRAM Voltage: 2.06
NB Voltage: 1.28
NB GTL Reference: .635
SBridge Voltage: 1.2
PCIE SATA Voltage: 1.50

Load Line Calibration: Enabled
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
CPU Clock Skew : Auto
NB Clock Skew : Auto
Cpu margin enhancement : OPTIMIZED

Advance CPU Settings
CPU Ratio Setting: 8.5
CPU VID: 1.2125
C1E Suppport: Disabled
Max CPUID Value Limit:off
Intel® Virtualization Tech: off
CPU TM Function: ENABLED
Execute Disable Bit: ENABLED

-i played with the cpu gtl reference and the settings above are the ones which worked.
-cpu margin enhancement is best at optimised

sorry if this is long-winded. i just wanted to give as much info as possible. any help would be greatly appreciated.