Does this seem OK?

Prime95 will load your cores far more than any normal everyday app or game.. is no way that the CPU will ever get that hot normally.. so 65/70c load is quite acceptable in Prime95.. some people even take it up to 80c but personally I limit myself to 70c
 
356 x 9 @ 1.4150V in bios, CPU-Z shows 1.240V at idle, 1.340 -> 1.370V load.
Prime 95 stable for over an hour, temps 59/59/55/58 load 33/33/28/32 idle

Getting there I think....
 
Heatsink wise I am using a thermarlright Ultra 120 Extreme which I have lapped, my CPU is lapped also... In the case I have 3 Delta EFB1212SHE fans (Rated @ 3700 RPM, 142 CFM and 52dB @ 100%) 1 of the fans sits on the Heatsink one as an exaust just behind it and the other sits in a modified karma drive bay fan and is ducted to the Heatsink fan, pics here and here

Air cooling is all about how much air you can pass through the heatsink and how quickly you can recycle the hot air out of your case... done a quick little experiment in this thread to demonstrate how fan speed on the Heatsink affects temps
 
Are there any advantages / disadvantages to changing the multiplier not the FSB?

356x9 is about the same as 400x8 - but at 1:1 Ram - that would give me a much better clock (although apparantly at 1:1 I am on 1333 Strap not the 1066 Strap - whatever that means).
 
Not a very quiet system I take it?

well not when prime testing no! But for normal everyday use the fans run at 1000RPM and they are no louder than the stock fans I had with the case certainly not noticable and they can idle along at 1000RPM and keep the system nice and cool for playing games / net surfing.
 
Are there any advantages / disadvantages to changing the multiplier not the FSB?

356x9 is about the same as 400x8 - but at 1:1 Ram - that would give me a much better clock (although apparantly at 1:1 I am on 1333 Strap not the 1066 Strap - whatever that means).

you want to keep the RAM at the tighest timmings you can which normally means a lower FSB and higher multiplier.. however @ 400mhz FSB and you have 800mhz rated RAM should beable to run at there stock timmings.
 
Latest attempt was 380x9 1.5050V in bios, NB upped to 1.29V

Was hitting about 59c under load but prime isn't stable yet. I am really nervous about pushing the CPU over this, and am unsure about the NB etc.
 
1.29 NB is fine, 59c is still pretty cool :) your CPU will throttle if it gets to hot which for your Q6600 is @ 95c.. really up to 65c is no problem.. again do not worry to much about the vcore is heat that damages the CPU not volts..
 
Ahhh - and since heat is a by product of increased voltage - if you're still hitting around 60c then it's all ok..

And there really is no damage caused by volts directly?
 
well all voltage increase is decreasing the life of the CPU.. but since most are designed to work for 20 years or so is decreasing its lifespan to 10 years anything to worry about? :)

If you used stupidly high voltage then I guess it would damage it.. only really no about air clocking where you would never put enough through to damage the CPU
 
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