PCWizard picNigel

>I have had CPU-z v 1.28.1 on my machine for some time and it>shows the clock speed at 2133 with an 8x multiplier, as per>the Intel specs. I downloaded the recent version 1.41 and it>shows a clock speed of 1600 with a multiplier of 4x, which>occasionally pops up to 2133 then drops back. The two tables>are shown on the attached screen shot. This I don

SEE my notes below...>>I have had CPU-z v 1.28.1 on my machine for some time and it>shows the clock speed at 2133 with an 8x multiplier, as per>the Intel specs. I downloaded the recent version 1.41 and it>shows a clock speed of 1600 with a multiplier of 4x, which>occasionally pops up to 2133 then drops back. The two tables>are shown on the attached screen shot. This I don

Nigel,What these other guys have said is good info. My advice is to only use Easy Tune to refine and test your overclock rather than to set it outright. I found that Easy Tune scales voltages and memory too far when it really doesn't have to, thus limiting your otherwise achievable overclock. Changin BIOS settings is the better option.For a 3.2GHz overclock at stock voltage, I set the following under the MIT menu in the BIOS:CPU Clock Ratio: 8XCPU Host Clock: ENABLEDCPU Host Freq: 400PCI Express Freq: 105 *CIA2: DISABLEDSystem Memory Mult: 2.00(which gives a resultant memory speed of 800MHz)Voltage Control: MANUAL(G)MCH Overvoltage Control +0.1V *CPU Voltage Control: NORMAL* these settings are made to overcome an issue that sometimes happen with the 965P-DS3 motherboard where after booting sometimes it runs much slower overclocked than when not.Give those a try and you should be right. Easy Tune should report 3200MHz now. Give it a stress test to confirm you have a stable overclock.GaryPS. My faithful old E6400 has just been ousted for a shiny new Q6600 G0. I was a bit concerned that my motherboard wouldn't overclock this chip very far, but last night it ran an 8 hr OCCT stress test at 3.5GHz @ 1.4V, with temp not getting above 57C using my Arctic Cooling Freezer 7 Pro. As you would expect, I am pretty happy :-)

Thx everyone for this great info, I have printed the last three messages and will study their contents. I already have CPU-Z and Prime95 (I used the latter to try and identify FSX crashing problems which came back to an inadequate 12v supply of my PSU), and I have just downloaded CoreTemp which seems to be a useful program. Once I pluck up courage and take the plunge, I will report back if my computer is still working!Nigel

GaryA further question - are you using stock cooling?Nigel

No, I am using an Arctic Cooler Freezer 7 Pro. But don't let that put you off, as I have overclocked C2Ds to 3.2GHz at stock voltage and on stock cooling. Yes it gets warm under load (60C ish), but it's still a good 10C off any thermal throttling kicking in. If you want to go any higher speed or need to boost voltage to get there then a better cooler is wise. My Arctic Cooler Freezer 7 Pro cost $25 and shaved a good 10-15C off my load temps. You can pay more, but the cost goes up much quicker than the temp goes down any further.Gary

Thx again, Gary

Gary - Nice O/C !Now you have me tempted to up the volts some more :)I'm at 3.34Ghz now with 1.375v. I noticed it seems Intel has upped the max volts to 1.5, in the past I was sure it was lower. I found Temps a not much an issue with FSX as it usually only loads 1-2 cores for any period of time.My goal would be 3.6Ghz ...

Mine wouldn't boot at 3.6GHz, no matter how many volts I feed it (1.5V max), BUT once in windows I can up the clock to 3.6GHz and boost the volts 1.45V and it survived a 30 min OCCT stress test. I had to load an earlier BIOS to get Vista 64 to install, and with that BIOS it would boot and run at 3.6GHz @ 1.4625V, BUT every second boot my sound wouldn't work (at any clock speed), so its back to the latest BIOS and using the in-windows overclock method to get to 3.6GHz. Considering my motherboard, being Rev 1.0, is only barely supposed to run a quad core, let alone overclock it, I am very happy with the results. All good fun :-lolGary

I'm sitting at 3.6ghz on air (zalman sink). It has been stable since July, no overclocks - this is may only rig, so it is on all the time.danon - I can post my voltage and ratio when I get back home.