You have a better than average Q6600 there, infact I would go as far as saying that is a very good Q6600... do you know what batch (FPO) ID? pulls similar voltage to my old Q6600 with the same vid could be a L373B..
I would suggest that CPU will hit 3.8ghz with decent air cooling... not sure what sort of air cooling you have on it atm.. but 75c with that low voltage I would check the mounting if its high end air you should be running cooler
Thanks
My Q6600 batch no: L720B060
I have been reading your air overclock thread and there are few things I would also like to point out about core temperatures.
I always use IBT now to check cpu stability as it stresses the cpu more than prime95. In IBT the aim is to get GFlops as high as possible, ideally close to theoretical maximum.
High GFlops means cpu is processing/executing the system of linear algebraic equations in the form of matrices by means of Gaussian elimination method
faster thus it is carrying out more work and hence generating more heat as a result.
High GFlops also means cpu will need more vcore to stabilise.
My main specs are in my sig and the cpu cooler is Thermalright IFX-14 which is a dual tower high end heatsink and the ancestor of thermalright silver arrow.
I have attached two 120mm Akasa Viper fans to IFX-14 as seen in the pics above. Now it's rated cfm is 83.63 which is meant to be high. However in real world tests at 12v it only managed about 32 cfm lol as seen in this review:
http://www.xbitlabs.com/articles/coolers/display/120mm-fan-roundup-2_15.html#sect0
The Vipers are still very good fan but I am not sure of what to make of the cfm.The only fans that give high airflow are the
delta fans. But they are noisy at full speed.
Another thing is that IFX-14 heatsink base isn't flat but rather slightly convex in the middle to provide greatest pressure at the centre of cpu IHS.
I did participate in IC Diamond testing and here is my post with all the details including my PC system and the IFX-14 mounting procedure.
http://forums.overclockers.co.uk/showpost.php?p=18814406&postcount=291
IC Diamond is sending me the pressure and contact measuring kit so it can be determined how much pressure my heatsink exerts and what is the contact pattern like on the cpu IHS.
If the base isn't flat but convex, this could mean that the base ends aren't exerting enough pressure on cpu IHS and thus the heat transfer by pipes isn't fast enough and still a lot of heat is concentrated at the base. In other words the heat accumulates at the base faster than it can be transferred away by heatpipes onto the heatsink fins hence temps are still higher.
If I do lap my heatsink base, I may well need 1 or 2 washers underneath the mounting system to have the same pressure exerted on cpu IHS as in the case of convex base. I think you also did something similar by placing a large washer underneath your lapped true heatsink.
Finally it is well know that Asus P5Q Deluxe having a 16 phase voltage regulator is the best skt 775 motherboard. Many people have managed to overclock
[email protected] with only modest voltage increases from stock voltages or VIDs.
Unfortunately my mobo GA-EP45-UD3LR is a strip-down version of the famous Gigabyte GA-EP45-UD3P and is a 4 phase mobo with a passive heatsink over the northbridge.
During running my computer, the northbridge gets very hot and it's heatsink isn't as effective as the one on P5Q Deluxe.
Another factor is that there is always 7-8C difference between the hottest cores and coolest cores. I have mounted my heatsink many times and still this difference exists. I suspect this is due to Q6600 not being a native quad core but rather is a two E6600s joined together in one package. So it is most probable that one E6600 naturally heats up more than the other.
So as you can see there are many factors which may well be preventing me from achieving even higher overclock bar IBT testing which I have discussed above
