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OC'ing P5QC, Q6600, 8800GT, TWIN2X4096-8500C5DF


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Ok Guys, you're the experts! I've been repairing computers for 21 years, but have almost finished a build (that I think) worthy of overclocking. You can check out the specs in my profile. I have a Masscool 8WA741 3-heatpipe CPU cooler on the way and am trying to get together whatever information I need. I've read tons of guides on overclocking, but I need some information on my particular system. I'd like to get the cpu to 3.0-3.2 GHz, OC the GPU a little and the memory if needed. Here are some pics of my available bios settings:






CPU-Z reports CPU=267x9.0=2405, Memory=534x2=1068 (5-5-5-15) What settings would you recommend changing to get to where I want to be?

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The revision is G0






Here is the screenshot from CoreTemp. Keep in mind, it still has the stock 0.65A Intel cooler on it. The Masscool won't be here till friday.




Here is a photo of the Masscool. I think (hope) it will be alright for moderate OC'ing.



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Download Memtest86+ V2.01 from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.

Download CPU-z from

Enter your BIOS, Load Setup Defaults, Save Setup Defaults and set to these values:

AI Overclock Tweaker

Configure System Performance Settings

Ai Overclock Tuner = Manual
CPU Ratio Setting = 9
FSB Strap to Northbridge = 333
FSB Frequency = 333
DRAM Frequency = DDR2-1066
DRAM Timing Control = Manual
CAS# Latency =  5
RAS# to CAS# Delay = 5
RAS# PRE Time = 5
RAS# ACT Time = 15
Row Refresh Cycle Time (tRFC) = 55 
All Else to Auto
DRAM Static Read Control = Auto
DRAM Dynamic Write Control = Auto
DRAM Read Training = Auto
DRAM Write Training = Auto
Mem. OC Charger = Auto
Ai Clock Twister = Auto
AI Transaction Booster = Auto

FSB Frequency = 333
PCI-E Frequency = 100
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
DRAM Frequency = DDR2-1066
DRAM Command Rate = 2N

CPU Voltage = Auto
CPU PLL Voltage = Auto
FSB Termination Voltage = Auto
DRAM Voltage = 2.1v
NB Voltage = 1.35v
SB Voltage = Auto
PCI-E SATA Voltage = Auto

Load Line Calibration = Auto
CPU Spread Spectrum = Auto
PCIE Spread Spectrum = Auto
CPU Clock Skew = Auto
NB Clock Skew = Auto
CPU Margin Enhancement = Optimized

Memory Remap - Enabled

Legacy USB = Disabled (For Memtest, Enabled After Memtest)

Run Memtest for two full passes. When assured of stable DRAM, then enter Windows and Run CPU-z and post screenshots of CPU-z's CPU, Memory and SPD tabs.

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I have a q6600 with a xigmatek HDT-S1283 120mm rifle. I will always suggest ANY with a q6600 overclocking or not to get an aftermarket cooler... that intel one SUCKS.


At 3.2 Ghz 8x400 in a room ~70F my processor under full load for 8 hours by prime95 were stable at 50C. My voltage in BIOS was 1.3V.


Mind that my case is an antec 900 with some fabrications for extra airflow. The 200mm fan above the 120 mm fan on the heatsink is a little overkill but it keeps that quad core cold.


My Vid was also 1.24V.


I am currently running my Q6600 at 3.3 Ghz and my DRAM at 1100 but have ran into some stability issues. I think its due to a large Vdrop on my board..


If you choose to OC, I suggest starting with 2.8 Ghz on stock voltage. You will not be able to keep your nice 1:2 ratio though.


I have had success on down clocking the RAM- then testing the processor with prime95 at whatever FSB and Voltage you decide until it is stable. THEN bump up your Dram frequency by playing with the ratios.


If you stepped to 2.8 Ghz you could probably set your ratio to 2:3 setting the RAM to 829 Mhz. Its a serious DC but it can help identify which part is failing when the OC is not stable.


My success OCs:

2.8 Ghz 9x311 1.24V stock Voltage RAM at 995 Mhz

3.0 Ghz 8x375 1.3V in BIOS ~1.28V i think with the Vdrop Ram at 1000 Mhz 2:3

3.2 Ghz 8x400 1.3V in BIOS ~1.28V i think with the Vdrop. Ram at 1000 Mhz 4:5

3.3 Ghz 9x366 1.35V in BIOS ~1.31V I think with the Vdrop (can you see my problem :)) Ram at 1100 Mhz

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