CPu Frequency spikes down while under full load

[TheNobody17]

So, after trying to overclock my fx-6300 on an ASRock 970 Extreme4 to 4.2GHz, I noticed the voltage fluctuating a little bit up but mostly down. During Stress testing with OCCT, the cores dropped down to 1.4 GHz, only to go back up to 4.2 GHz (monitored using HWMonitor). I Have Cool'n'Quiet disabled and Load line Calibration set to auto. However different settings on LLC were leading to the same Problem. Lowering the Voltage lead to my pc freezing, whilst upping it yielded the mentioned results. Any Idea what's going wrong? I'm Idling at ~36C and under full load right below 70C.
While gaming, no fluctuation or spikes seem to be happening

 

[CountMike]

Which CPU cooler ? OCCT and other programs like that load system higher than any normal SW/games would, not real measure of stability. I consider my OC successful when it passes all tests in AOD.

 

[TheNobody17]

I'm using the Shadowrock from bequiet!
Thanks for the info, i'll give that a shot. Something else i've noticed was during gaming, all my cores had eventually been at 3.2 GHz and then gone back up to 4.2. So the spikes also seem to happen during games,
You're talking about amd overdrive, right? Which tests should i do to check stability?

 

[sizzling]

Put the CPU back to stock speed and test again. The drops in game could be overheating VRM's, if they overheat the CPU will throttle down to reduce the power the CPU needs.

 

[CountMike]

Yes, AMD Overdrive. There's Stability test and Benchmark. Make sure you turn Logging on so you can see what was happening during tests. Look at it as soon as test finishes.

 

[TheNobody17]

After resetting to UEFI Defaults and running OCCT again, there were no downward spikes.
The Benchamark gave me a total score of 10000, with an Integer score of 60000, Flowpoint Calculation of 16630, Storage Speed of 1930 and Cache speed of 21441.
I'll have to run the stability test again since i forgot to turn logging on, results on that later.

 

[CountMike]

VIN0 will be your CPU voltage thru the test/benchmark.