You have to disable EIST so the multi doesnt lower itself to 6, but it only does so on idle and doesn't affect performance, you should disable it while overcloquing to achieve stability and then you can enable it again. You can test the HD performance with HD Tune o HD tach if you have winXP.
This is how my BIOS looks like for a Q6600 this has been 100% stable for the past 5 months.
JumperFree Configuration Settings 450
CPU Frequenz: 3600
Ai Overclock Tuner: Manual
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
FSB Strap to North Bridge: 266
FSB Frequency: 450
PCI-E Frequency: 100
DRAM Frequency: 1800
DRAM Command Rate: 1
DRAM Timing Control: Manual
CAS# Latency: 7
RAS# to CAS# Delay: 6
RAS# Precharge: 6
RAS# Active Time: 14
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: (Auto) Disabled
DRAM Dynamic Write Control: (Akt) Disabled
Ai Clock Twister: Strong
Ai Clock Skew for Channel A: Auto
Ai Clock Skew for Channel B: Auto
Transaction Booster: Activated
- Boost Level: 2
CPU Voltage: 1,54 (crappy quad I know)
CPU PLL Voltage: 1,66
FSB Termination Voltage: 1,5
DRAM Voltage: 2.06
North Bridge Voltage: 1.61
South Bridge Voltage: 1,05
Clock Over-Charging Voltage: auto
Load-Line Calibration: Disabled
CPU GTL Voltage Reference: Auto
NB GTL Voltage Reference: Auto
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
Advance CPU Settings
CPU Ratio Control: Manual
- Ratio CMOS Setting: 8
C1E Suppport: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Enabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
PECI: Disabled
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