here you go mate just found a nice little read for you:
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First, I assume no responsibility for anyones overclocking exploits using this little write up. This is meant only to teach the basics of overclocking with this setup and my options will not work for everyone. I have a pretty extensive watercooling setup, so please keep that in mind. I recommend no higher than 3.4Ghz on air just because I don't like temps getting high. So, with the legal kinda stuff out of the way, let's start!
Ok, here is the lowdown (remember, I'm not an expert) on overclocking a Q6600 CPU and Gigabyte GA-P35-DS4 Rev.2 Motherboard. First consideration anyone must take is cooling. Without proper cooling, the heat caused by overclocking will greatly reduce the life of your CPU or even worse, fry it. There are many great air coolers out there and if one wants to get even higher overclocks, watercooling is another option. On air, I would not try to go over 3.4Ghz, if even that high. With that out of the way, lets take a look at the important BIOS screens and explain what each option does in order and show you what my settings are. (at least the ones I know/I will be skipping the options that don't deal with overclocking or are self explanatory/pictures are below)(Remember, I am at 3.8Ghz, which is not recommended on air, so not all of your options will match mine):
1. Main BIOS Screen:
- Only thing to discuss about this screen are how to enable the
advanced options. While on the main screen, press CTRL+F1 to enable
advanced options under the M.I.T. section of your BIOS.
2. Advanced BIOS Features:
- HDD S.M.A.R.T. Capability: Enabled (Checks for problems with your HDD's)
- CPU Hyper Threading: Enabled (Q6600 can support, so leave enabled)
- Limit CPU I.D. Max. to 3: Disabled (Only enabled for older OS's)
- No-Execute Memory Protect: Enabled (Not sure, left at default)
- CPU Enhanced Halt (C1E): Disabled (Lowers FSB when computer is at idle)
- CPU Thermal Monitor (TM2): Disabled (CPU Overheating Protection, use
coretemp or something similar instead and do it yourself)
- CPU EIST Function: Disabled (Lowers VCore and FSB to reduce power
consumption)
- Virtualization Technology: Enabled (Enables you to run multiple OS's)
- Init Display First: PEG (Sets what display initializes first. If using your
PCI-E 16x slot, set to PEG)
* C1E, TM2, and EIST are all power saving functions. To help produce a stable overclock, these must be disabled in the beginning.*
3. MB Intelligent Tweaker (M.I.T.): The most important page, the OC page!
- Robust Graphics Booster: Auto (Up's graphics performance, leave at
default Auto)
- CPU Clock Ratio: 9X (Sets the multiplier for the CPU. Multiplying this by
the CPU Host Frequency gives you your CPU Ghz. I like to leave mine at
9X, but it is all preference and what works the best for you)
- CPU Host Clock Control: Enabled (Let's you adjust you CPU Host
Frequency (Mhz) )
- CPU Host Frequency: ? (Set at what you want to achieve. Remember,
times this number by whatever you Clock Ratio is to achieve the OC you
want. I'm at 3798Mhz so I have mine set at 422 because 422 x 9 =
3800.)
- PCI Express Frequency (Mhz): 100 (Adjusts your PCI-E frequency. 100
seems to work the best for me, which is default, but I set it myself)
- C.I.A.2: Disabled (Auto overclocking when your computer is under load,
not very good. You can't have this set while you manually overclock,
won't be stable.)
- Performance Enhance: Standard (Another auto overclocking tool. Leave
at Standard for the same reason as above.)
- System Memory Multiplier (SPD): ? (sets the ratio of FSB:Ram. Will
depend on what your CPU Host Frequency is set at. For CPU
overclocking, try to keep it as close to your Memory's rated speed as
possible. After you get your CPU stable, you can mess with it. Use the +
and - keys to go thru the options. At 2.00 with my FSB of 422, I get 844
which is as close as I can get to my rated 800Mhz Mushkin memory.
Anything higher than that and my computer becomes unstable.
Remember, set this as close to stock memory speed as possible before
saving and rebooting.)
- Memory Frequency: ? (Will change based on the setting you use above.
This is what you want to try and have as close to your stock memory
freq as possible.)
- High Speed DRAM DLL Settings: Option 1 (No idea, just left at default)
- DRAM Timing Selectable: Auto (This is what you enable to adjust your
memory timings and such. Leave on Auto until you get a stable CPU
overclock then you can adjust these.)
*These below options are the most important. While adjusting these watch your temps very carefully. The max I recommend going on a Q6600 for VCore is 1.6V, at that's only with outstanding cooling.*
- System Voltage Control: Manual (Allows you to adjust your voltages)
- DDR2 OverVoltage Control: ? (Adjusts the voltage to your RAM. Find out
what your RAM is rated for and adjust till you get the voltage there. Use
a program like Everest to watch the voltage. My Mushkin RAM is rated
for 2.1V so I added +.30 to get it there. Our motherboard is set at 1.8V
default.)
- PCI-E OverVoltage Control: Normal (Controls the voltage to your PCI-E
Bus. Leave at Normal.)
- FSB OverVoltage Control: ? (Controls the voltage to your FSB. Useful to
raise if you can't get a stable overclock while raising VCore. This also
raises your temps less than raising VCore does.)
- (G)MCH OverVoltage Control: ? (Raises the voltage going to your Chipset.
Also assists in making an overclock stable but only in more extreme
overclocking situations. I did not need to raise this until I was at 3.6Ghz
and above.)
- CPU Voltage Control: ? (Also known as VCore. This raises the amount of
voltage actually going to your CPU. This is the most important voltage
control in terms of overclocking. I recommend never raising this above
1.5V on air and 1.6V on water, the less the better though as the higher
this is the more heat your CPU will produce. Remember, what the BIOS
says is not extremely accurate due to VDroop. VDroop is where the
voltage that is loss as it moves from the power supply to the CPU just
as a car engine loses horsepower as it moves from the engine to the
wheels itself. Use Everest or a program like it to find your actual VCore.
As an example, my VCore in the BIOS is set at 1.525V but on Everest it
is actually only 1.48V.)
- Normal CPU Vcore: 1.30000V (Shows what the stock VCore is, does not
matter really as this will never change.)
Well, that is about it for overclocking in the BIOS. So, here is the best way to overclock in my opinion: First, disable all of the power saving features that I discussed above and adjust your BIOS accordingly. Second, set the FSB Frequency and Multiplier to what you want to achieve. (As an example, 9X Multiplier and 355 FSB Frequency to achieve 3.2Ghz) Next, save and reboot and see if you can POST and start Windows. If that works, run a program like OCCT and see if it is stable at 100% load. If it won't POST or remain stable, raise your CPU Voltage (VCore) one step and repeat. Keep doing this until you reach a nice stable setup. Once you feel like it is stable, run OCCT for a minimum of 6 hours (I recommend overnight) and make sure it is completely stable as sometimes it will take hours before it crashes. Remember to watch your temps. Anything over 65C in my opinion is not safe and definitely not worth the risk. After about 20-30 mins your temps should not go up anymore so you don't have to stay up all night watching them. (Also, with OCCT, if you start CoreTemp then go to custom setup on OCCT and select CoreTemp for monitoring, you can set a cut off temp and it will shut down the test if it ever goes over that temp.)
Here is what my setting were at to reach certain overclocks (Just as an example):
3.2Ghz:
CPU Clock Ratio: 9X
CPU Host Frequency: 355
System Voltage Control: Manual
DDR2 OverVoltage Control: +.30
PCI-E OverVoltage Control: Normal
FSB OverVoltage Control: Normal
(G)MCH OverVoltage Control: Normal
CPU Voltage Control (which is your VCore): 1.325
3.6Ghz:
CPU Clock Ratio: 9X
CPU Host Frequency: 400
System Voltage Control: Manual
DDR2 OverVoltage Control: +.30
PCI-E OverVoltage Control: Normal
FSB OverVoltage Control: +.15
(G)MCH OverVoltage Control: Normal
CPU Voltage Control (which is your VCore): 1.45
3.8Ghz:
CPU Clock Ratio: 9X
CPU Host Frequency: 422
System Voltage Control: Manual
DDR2 OverVoltage Control: +.30
PCI-E OverVoltage Control: Normal
FSB OverVoltage Control: +.20
(G)MCH OverVoltage Control: +.20
CPU Voltage Control (which is your VCore): 1.525"
source:
http://www.overclockingwiki.org/forums/showthread.php?p=22827
RAM 2:3 
