Prime Currently running temps @71C - need quick reply!

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I don't believe any air cooling solution would let you get 3,6 GHz at 60º. When you are over 3 GHz on a Q6600 Heat starts to increase exponentially.
Your previous cooler wouldn't have been able to take you to a stable 3,4 GHZ, remember you where testing it with much lower voltages (which is why it was unstable).
I believe you should be very happy, you got to reach your goal of 3,6 GHz plus you made it without reaching 70º, that's amazing considering your CPU and that you're on air.
By the way, never use more voltage than the minimum needed by your hardware (at your desired setting), if you increase them, you will be just creating more heat and shortening the life of the component.
 
completed a few tests today trying to lower the NB voltage. I've found out in order to stay stable for longer in Prime I have to keep the NB at 1.58 (lasts 6hrs), compared to 1.56v (3 hrs) and 1.54 (just over 2hrs).

I'm going to increase the CPU voltage again just once and see if i can beat the 6hrs i could previously achieve. This will take it up to 1.43125v in bios and probably a max of 1.38v in CPU-Z.

i think i am nearly there. once i am, i will try and lower the other voltages again becasue i am far happier with testing temps now and don't feel i am risking my CPU too much.
 
the sunbeam cooler works great just make sure your case is large enough

also be sure to tape the bottom and top of the heatsink where the fan meets, there's a gap between the fan and heatsink, and adding tape to it gave me 4C reduction in cpu temperature to the already low temperatures that the cooler got me.

just make sure the cooler can fit your case properly or you may wind up with something like this

here is a pic of it on my pc, (i know my pc is extremely ugly :) ) (sry for the poor image quality )

heatsink1nc1ek9.jpg

fill sized http://img80.imageshack.us/img80/4828/heatsink1nc1cv2.jpg
 
Razor512 - There are gaps between my cooler and fan too and i do notice the air escaping if i open the case and put my head up t it. I'll give it a try.

Does anyone know what would be the highest/safest NB voltage to go up to?

I've done a little more testing and increasing the CPU voltage beyond 1.425v doesn't improve stability. I believe I have tried up to 1.45v.

I don't know if the other voltage settings are hindering my stability. My voltage settings are below:

CPU - 1.425v
PLL - 1.6v
VTT - 1.4v
Mem - 2.2v (1066, 5-5-5-15-2t)
NB - 1.58v
SB - 1.55v
1.2HT - 1.25v
GTL_REF - +50mv
Loadline Calibration - enabled

Thanks again.