The versioning is kind of counterintuitive. The beta 4.51D was actually released later than the stable 4.6 and uses updated microcode from AMD. What everyone including me does not understand is that ASRock does not release a stable bios which incorporates the stuttering fix along with other problems like the reset of certain bios options (XMP profile and GPU configuration) when disconnecting the power cable.

Source wrote: After contacting ASROCK support, I was told to downgrade to Bios [Beta] 4.51D    2018/5/2  Agesa Version to PinnaclePI-AM4_1.0.0.3b.   Even though it isn't the latest bios (4.6) it actually works a lot better! The stuttering is indeed still there sometimes, but very rarely happens! Games are now playable and enjoyable! :-D !!

]]> Sat, 23 Jun 2018 18:22:38 +0000 https://forum.asrock.com/forum_posts.asp?TID=8985&PID=52950&title=ryzen-2400g-stuttering#52950 https://forum.asrock.com/forum_posts.asp?TID=8985&PID=52901&title=ryzen-2400g-stuttering#52901 Author: Source
Subject: 8985
Posted: 22 Jun 2018 at 1:26am

gizmic wrote: 30-45 is already considered laggy if you ask me  i think best way is to do the tuning warrant is void only when the cpu is set over spec. So in your case from what you said lag comes when the gpu dips  it could be throttling or something else no way a gpu could dip clocks during a game from what i can see you can try these edit the lower range p-states to a higher value so it wont dip that far or maybe clocks can be manipulated from setting a higher value on power options (not sure if it follows this). use logging softwares for gpu/cpu speed, temps and usage so you can find out if high temps are causing the dips or low usage and talking about balls to the wall my cpu on default/auto settings has crazy high vcore 1.45v ive manually tone it back to 1.2ish

That's a matter of opinion. Consoles run (still do?) some or most games at 30 fps. Perfectly playable for many couch games. :-D Problem is now fixed. (Somewhat)

use logging softwares for gpu/cpu speed, temps and usage so you can find out if high temps are causing the dips or low usage

and talking about balls to the wall my cpu on default/auto settings has crazy high vcore 1.45v ive manually tone it back to 1.2ish 

Haven't looked at it that detailed,

however if you use Ryzen master, it's locked the cpu voltage to 1.45 and boost to 3.9GHz

Could be. As i mentioned. Tweaking and tinkering with it, you can find a solution, by locking the multiplier and locking the core clocks on the GPU and CPU. Then it runs fine.
However doing that with Ryzen master, you can lose your warranty on your CPU. 
I'm not going to do that...

Also you lose all energy saving and boost when you lock it.  - Don't want it to run balls to the walls 3.9GHz when I'm just watching netflix. -_-

Done. Please check the main post again.