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B450 Gaming K4 + Ryzen APU

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speedphlux View Drop Down
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Joined: 05 Dec 2018
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    Posted: 05 Dec 2018 at 3:41am
Hi there,

Recently saved up a bit of cash and went on to buy myself a new PC. Ended up with the following components :

AMD Ryzen 5 2400G
ASRock B450 Fatality Gaming K4
16GB (2x8) HyperX Predator - HX430C15PB3K2/16 (QVL listed)
DeepCool DQ550ST 80+ Gold PSU

Been rocking this build for almost a week now and it's great in terms of daily workload. All the drivers are the latest, BIOS has also been updated to 1.50. RAM has been set to XMP Profile 1 and then "downclocked" from 3000 to 2933, as I've heard that Ryzen doesn't like 3000 very much. So yeah, when it came down to gaming and unwinding, there was a little bit of stuttering and artifacting at times. Nothing major, just annoying the crap outta me.

So I went around, read a bunch, watched some YT videos and what not and made up my mind that I want to overclock the iGPU part of my APU, to get in a little bit more stable gaming, without the stutter and artifacting. Disabled PBC, Cool'n'Quiet and C-State as advised, then proceeded to thinker with the rest of the settings.

Now, at "stock" settings, the CPU_VCORE voltage reported in HWMonitor was roofing all the way up to 1.562V, which looked to me to be unsafe. So with the Precision Boost Clock and C-State disabled, I turned to the CPU to manual and set it to 3600 MHz, lowering the voltage to 1.4V, which at least in my eyes, looked a lot safer. Without touching the GFX yet, I went back into Windows (10 Pro x64 BTW, in case you're wondering) to check the voltages for the CPU_VCORE and to my surprise, they were maxxing out at 1.312V while under stress (AIDA64), way less than what I've set in the BIOS. So I went back to the BIOS and tried lowering the number down to 1.35V. Unfortunately, this time the PC hang up while stress testing it, so I went back and dialed in 1.4V as it used to be. Went again for stress testing - full hour, no problems.

I'm not after CPU Clock speed anyways, so 3600MHz is perfectly fine for me. Could even downclock it for all that I care. Games I'm playing are not the latest AAA titles anyways, so that's not an issue for me. Playing mostly World of Tanks and Star Wars The Old Republic. Problem came when I tried the "GFX" values. VDDCR_SOC value reported in HWMonitor at "stock" was hovering around 1.1V, which seems pretty fine. Problem is, this is an APU, which means any sort of overclock to the iGPU part, will result in an increase of SOC voltage as well, right ? So you understand why things got a bit awkward from here on now. My APU suffers from something called "Black Hole". Any GFX Clock value that is between 1300 and 1450, simply results in a TDR BSOD. I've found a stable setting at 1500MHz, but that required for me to input 1.3V-1.35V as my GFX Voltage, which immediately jumped up my VDDCR_SOC value displayed in HWMonitor all the way up to 1.3V as well. So, my question is - is that even safe for the VRM of the Gaming K4 ? Artifacting and stuttering were mostly cured with those settings, but I am kinda worried not to fry anything at this moment, so I went back in and locked it back to "Auto" on both GFX Settings in the BIOS. And yeah, I did clear the Advanced > AMD thingy > iGPU Overclock values too, so I know I'm running at 1240MHz with stock SOC Voltage. BTW, those VID values - I really hope ASRock dumps them off at the next BIOS update.

I'm quite surprised how people are running AB350 version of the motherboard I have and are able to run the 2400G at 3,9GHz with the iGPU all the way to 1600MHz on a stock cooler with way less voltage than what I've encountered.

TL;DR : When using an APU, what are the safe Voltages values for the SOC and GFX in the BIOS ?
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