4790K overclocking instability

[The117thCon]

So Hi I am currently overclocking a 4790K and am struggling to get a 100% stable oc on it, I have up to 4.6GHz stable and am about 90% stable at 4.8GHz and probably 70-85% stable at 4.9, any ideas on ways to increase stability? Currently have a ton of Thermal Headroom but yeah struggling to get stable.

Specs
Intel i7 4790K, Delidded and using Liquid Metal on both sides of IHS
Noctua NH-D15 chromax.black
MSI Z97 Gaming 5 Motherboard
32GB Kinsgton DDR3 Savage rated for 1866MHz but running stable at 2133MHz
MSI GTX 1080 Gaming X 8G
MSI GT 1030 OC Edition
Thermaltake Smart DPS G 700W 80+Bronze PSU
NZXT H500 Case
3x Noctua Industrial 3000RPM NF-A14 as Intakes
1x Noctua Industrial 3000RPM NF-F12 as Exhaust
Windows 10 Pro For Workstations Ver 1903, Build 18363.535

[Levent]

First of all there is no percentage on stability, its binary, meaning its either stable or its not. Start by identifying when your overclock fails, (like AVX loads etc) and monitor your vdroop (meaning how much your cpu vcore drops when you put load on the cpu).

[The117thCon]

Currently I am failing on Heavy AVX2 loads (OCCT being used for stability testing)

 

Most loads i.e. Handbrake, Cinebench, Video Editing Gaming its perfectly fine but any full on stress test it crashes with a BSOD with either Clock_Watchdog_Timeout or Machine_Check_Exception

[Bombastinator]

I’ve got tons of thermal headroom too, and couldn’t get my 4770k really stable at above 4.0.  My memory is that 4.6 is actually pretty good.  There’s no guarantee of what is available on a given chip.  I could get mine stable in stress tests at 4.1, but in regular gaming it would still crash a week or two later.

Edited January 5, 2020 by Bombastinator
Added to

[Levent]

1 minute ago, The117thCon said:

Currently I am failing on AVX2 loads

 

Most loads i.e. Handbrake, Cinebench, Video Editing Gaming its perfectly fine but any full on stress test it crashes with a BSOD with either Clock_Watchdog_Timeout or Machine_Check_Exception

If your motherboard supports AVX offset (meaning it will decrease cpu core speed when AVX load is detected) use that. I usually counter that with just pushing more voltage.

[The117thCon]

Also just checked not reading any vcore voltage Drop

[The117thCon]

Know where AVX offset might be if it does support it?