CPU Power delivery issue?

EisVogel · January 20, 2018

Specs:

CPU: i5 6600k @ 4.0 ghz (Auto Voltage)

MB: MSI Z170-A Pro

PSU: Corsair Vengeance 650W

GPU: Reference 1070

2 SSDs 1 HDD 4 RGB Fans + Watercooling on the CPU

Hello Guys, this is the first time i am posting here so bare with me

So, when i installed my new Corsair H60 i went ahead an tried to overclock my 6600k a bit more then i am used to.

I am currently running a 4.0 Ghz overclock on stock voltages set to auto.

Of course i did some research about other 6600k owners settings on specific motherboards but then i tried a 4.5 Ghz overclock on 1.370v.

I also tried serveral overclocks from 4.2-4.6 Ghz with varying voltages from "auto" to 1.45... i think.

however the cpu either crashes on higher overclocks but i encountered something i am not famililar with.

When i actually get a "stable" overclock (and by stable i mean, it's not crashing and i might misunderstood the term "stable") i encounter this issue that in benchmarks like cinebench or prime the shown clock speeds go all the way down to 3.8 or 3.5 ghz (tested with core temp)

So, this is my question. Could it be that the 8 pin power connector on my motherboard is somehow defective, not strong enough or some other issue?

Could there be something wrong with the psu, mobo power delivery or the cpu?

Thank you for reading my post, i hope i am able to help you out in some other way soon.

Philip

Crunchy Dragon · January 20, 2018

If anything, sounds like a motherboard VRM problem. Or maybe just not enough voltage, I believe you can go up to 1.5v without frying something(been a while since I actually looked at what kind of voltages are needed).

An overclock is determined stable when it can run a stress test for a long time and not crash(usually people recommend several-24 hours depending on overclock and CPU).

Welcome to the forums!