8700k and the Overclocking Lottery

RaidHobbit

Distinguished
Jun 19, 2014
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i7-8700k
Noctua U9S CPU Cooler (2 Aestek Extreme Performance Micro fans fitted)
Cooler Master mATX Silenco 352 case (2 front and 1 exhaust fans fitted)
Gigabyte Z370 D3H
16GB DDR4 Ram 2666
GeForce 970 GTX
Win 10

Under full load:
4.9 Ghz Stable all cores (Gigabyte Easytune)
5.0 Stable all cores 67C (Manually altered the multiplier)
5.1 Stable all cores 74C (Manually altered the multiplier)
5.2 System instantly freezes (Not sure how to safely alter the voltage or what safe values are? Auto manage takes it 1.3-1.4 volts)
 

RaidHobbit

Distinguished
Jun 19, 2014
377
20
18,815


Any other ways to improve stability then if 1.4 volts is the limit?