Ivy Bridge overclock with minus offset

keyser

keyser

keyser

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I flashed my BIOS and lost my settings so I thought I'd do a simple OC! Turbo Mode enabled and doing the multiplier, as I want a moderate oc with as few volts (and therefore temp) as possible. I'm currently testing stability with 4Ghz on minus 0.08v offset.. on my NOFAN heatsink! (FT02 and 3x 180mm fans help) Prime95 running for 30 mins while browsing is a good test. 79C on 2 of the cores, one of them a mere 73C. I read that this is as hot as it gets (bar IBT!) due to AVX instruction adding some extra volts to vcore. Gaming and everything else that doesn't use AXV (like Intel Extreme Tuning Utility) is ~10C lower.

My previous cooler was the Macho w/ 140mm fan and on 4.2Ghz and +0.005v I seem to recall.

Is this just a quirk of Gigabyte motherboards or normal? Is there a way to test idle 'stress'? I need a test that starts and stops a lot.

Also this is the first time I used Intel Extreme Tuning Utility, I may have tweaked my FSB/BLK down from 100.003something to 100 exactly. Now cpuz says 3990.48MHz - which one has the rounding error? :)
 
Trydisabling CPU sread spectrum and see if it gives a true 4ghz

You need to let it sit at idle in the desktop for idle stability
 
Well I've had overclocks that pass stress testing yet fall over when sitting idle at desktop,that's usually down to too low a CPU idle voltage

I found by choosing a lower llc and more offset let's the CPU idle with a slightly higher voltage while keeping load CPU voltage the same

I
 
Seems stable, peeked at 79C for 2 cores, I take it that's acceptable since normal tasks will be much lower than that. I'll test it doing nothing now :)
 
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