Overclocking the Q9650 to 3.6GHZ Stable.


Nov 12, 2007

I was wondering if anyone can help me achieve a stable overclock of the Q9650 to 3.6 GHZ.

1. My Setup:
Intel Core 2 Quad Q9650 @ 3.30 ghz w/ CoolerMaster GeminiII (Ambient Temp ~30-40 C).
Gigabyte GA-EP45-UD3R ATX
A-data Extreme Edition DDR2 800 (2 * 1GB) @ 4-4-4-12 2.0v http://www.newegg.com/Product/Product.aspx?Item=N82E16820211174
OCZ StealthXstream 600W

2. What I've tried:
Currently, I've tested my system at stock settings with Prime95 for 48 hours with 0 errors. I've also used Memtest and made sure my RAM was stable at the timings and voltage.

I tried adjusting the FSB to 366 MHZ, while leaving the other settings in BIOS on AUTO and Prime95 runs fine without any problems (temperatures at full load is ~60 C). When I try to push the FSB to 400 MHZ, the board POSTs and Windows would load fine. However, the moment I stress the system with Prime95 Large FFT's, it crashes (temperatures are still at ~60C during this load).

Below is the profile I've tried to adjust for 400MHZ (the highest voltages I've tried so far), but I have yet to find a setting where the system would still remain stable under Prime95.
CPU PLL=1.500000 Volts
CPU Termination=1.28000 Volts (Default 1.20000 Volts)
CPU Reference=0.760000 Volts
CPU Vcore=1.330000 Volts (Default 1.250000 Volts)
DRAM Voltage=2.000000 Volts
DRAM Termination=0.900000 Volts
Channel A Reference=0.900000 Volts
Channel B Reference=0.900000 Volts
MCH Core=1.200000 Volts (Default 1.100000 Volts)
MCH/DRAM Reference=0.900000 Volts
MCH Reference=0.760000 Volts
ICH I/O=1.500000 Volts
ICH Core=1.200000 Volts (Default 1.100000 Volts)

Any suggestions are more then welcomed. I usually don't overclock my systems, but since everyone's been saying this CPU overclocks really easily, I thought I'd give it a shot.


Aug 28, 2008
I got an Q9450 and a gigabyte ud3 board. With the gigabyte tuning things (located on cd) I got the cpu to 3,2, easy, on stock cooler. When i get my cpu cooler, I will try 3.6.
Try the tuning things (located on cd) and see where those can get your cpu to.
Then you can see in bios, all changes from previus settings, and go from there.
Have a nice overclock.