B450 Gaming K4 + Ryzen APU

I happen to try something new for my system as I didn't like my temps. Using the latest BIOS with the option to do vcore and SOC offset, I offsetted both down by -100 (millivolts I assume) which is the max allowed, and turned boost back on, since I had to turn it off or else megatemps ensued. Turns out everything runs nice and cool now, so basically I would say for this Mobo and latest BIOs the default voltage are WAY too high. In fact I pulled down all of the voltages that I could find to match what 'Ryzen DRAM Calculator' suggests.

Finally had some free time to test your theory out and you are on the right tracks to some extend.

Set the CPU clock to 3500 MHz with the VCORE voltage set to 1.3 V initially. Ran some stability tests - all passed with flying colors. Went back to BIOS and tried to see if I can just set the GFX Clock to 1240 MHz, so it doesn't downthrottle any more, which is what I believe to be the cause of screen flickering and artifacting. Left the GFX Voltage to Auto. Ran some tests - PC froze up. Went back into the BIOS and bumped up the GFX Clock to 1500 MHz and set the GFX Voltage to 1.225 V. Ran some tests again - they all passed. Increase of around 3 FPS in CB R15. However, in the AIDA64 stress test on both CPU and GPU, proved to be getting a bit too warm for my comfort. After 2:30 minutes, the CPU temp hit 85 degrees Celsius, so I stopped it. PC is working fine thou, so now what I think I'll do, is to try downclock and undervolt the CPU even more, since I'm pretty sure my GFX doesn't understand anything between Auto and 1500 MHz speeds. But at least it's stable at somewhat reasonable SOC Voltages.

You've been most helpful ! :)

Stock base clockspeed is 3600, but with boost on mine goes to 3900, the vcore goes to 1.5v and it promptly hits the temp ceiling of 95C (PROCHOT). I wonder if this is complicating your matters? You could try setting CPU to 3500 with 1.25v (in bios, Ryzen Master doesn't work at least not for me), and then trying to mess with GFX.

Safe voltage is 1.2v, which is the default target of 1.1v on this board with 1.8 bios. I have my 2400G at 3500@1.25V with boost off, VEGA left at default which sits at 1000 with voltage peaks of just under 1.2 which is max recommended, but RAM is 3200/14@1.35v to give excellent and efficient performance while running very cool.

Your post appears to have fallen through the cracks it seems. This happens sometimes when posts are made during a particularly active period on the forums.

I am afraid I don't have any info on max safe voltages for the Raven Ridge APU lineup. If you are concerned you can try open a support ticket with ASRock Tech Support: https://event.asrock.com/tsd.asp

This is a community forum and while ASRock_TSD posts here fairly often these days they don't catch everything. This means that you only get replies when a forum user has an answer for you. In specific cases like yours, often no one knows. Your best bet with specific technical questions is to contact tech support, either ASRock's or AMD's, either should have the answers you are looking for.