I gave up on the overclocking front, no success to me.
Stock rates or unstable system is the choice I have.
Maybe future BIOS updates will change something but I don't think so.
Furthermore, another word of warning:
My new system causes massive noise induced through the PCIe connectors whenever there's GPU activity.
This must be a mainboard thing, because the GPU and my soundcard are the same as before, and I cannot cure it by moving the soundcard to another PCIe slot or by attempting to shield it.
My Soundcard is - or better
was - a Soundblast Z internal PCIe card.
I can put it right next on top or below the graphics card, or 3 slots further at the other end of the motherboard - no change.
There's no other cable crossing the Soundcard. No front panel connected either.
CPU load doesn't cause anything similar.
Disabling C-States doesn't help either.
As soon as the GPU becomes busy, there's all kind of freaking noise on the microphone input.
The only way to get rid of it is to apply the background noise filter on the Soundblaster config panel, but that makes the mic sound like you've got a pillow on your mic.
I've tried many things and finally kicked out the Soundblaster and switched to the onboard sound instead.
It shows the same GPU dependent board-induced noise, but at least he noise filter works much better there.
I did consider buying a USB soundcard already, but stepped back from that after having read about the massive driver/software issues people are having with these on Windows 10:
https://www.amazon.com/Creative-Performance-Headphone-Integrated-Microphone/dp/B00EZT7RE4https://www.amazon.de/Soundkarte-Doppelmikrofon-Array-konfigurierbare-Studio-Audiotechnologien-600-Ohm-Kopfhörerverstärker/dp/B00F8VB0IW
I'll try whether I can deal with the onboard sound.
If not, I'll have to see what I can do.
Either way, can't really recommend my new mainboard, a Gigabyte Z390 Gaming X, because of the noise it seems to have on the PCIe lines.
Mike