Welcome back!
Made sure to get the newest drivers? Specially BIOS and GPU.

I don't think I've updated BIOS, but did use the uninstall driver program (DDU?) and reinstall GPU driver.

did you install the CPU cooler correctly?

BIOS update is a must. If the motherboard shipped with one of the first BIOS versions this could cause major instabilities.

Like I made this Stream/Media Server
CPU: Ryzen R7 1700 3.9GHz
GPU: MSI GT 1030 Passive Cooled
Motherboard: Gigabyte AB350M Gaming3
Cooler: Corsair H100i
RAM: 2x8 16GB G.Skill Flare X 3200MHz
PSU: Corsair RM750x Gold
SSD: Crucial MX300 275GB
HDD: 5x 3TB WD Red
Case: Fractal Design Node 804

I did update BIOS instantly. But after having an weird unstable OC, where i had to flash BIOS from new it actually went back to the first BIOS versions without my knowledge, where i fought hours with unstable network card, unstable RAM and a BIOS interface impossible to work with.
I then noticed it rolled back the BIOS version, so i updated to the newest version again and it fixed all the mentioned instabilities.

After this do some stress testing like Prime95 while watching your temperatures. HWmonitor for monitoring temperatures and voltage.

BTW your RAM is probably running 2400MHz if you haven't changed it in BIOS.

This post was edited by ZwiX on Sep 23 2017 04:30pm

BIOS is now updated.

So how do I change ram to 3200 MHz?

This post was edited by Splattish on Sep 23 2017 05:41pm

Test with Prime95 gave me the temp 72.0 C

I set it to D.O.C.P standard, I think it is 3200MHz now?

This post was edited by Splattish on Sep 23 2017 06:28pm