My 2060 Super does 1440p at high or ultra on most games. 60fps easily even with an old 6700k. It is not good enough for my display however so I'm needing to upgrade the platform soon so I can hit closer to my 144fps margins.
Your memory speed might be a factor in performance, but memory speed isn't likely to cause micro-stutters. And, you need to determine if you have stutters or micro-stutters, or if it's actually a stutter issue at all, because they are not the same and they have generally different causes.
I agree that more, and faster memory is a good idea in any case, because 8GB might be low in some circumstances and 2400mhz is pretty slow for Ryzen, but if that fixes the problem then micro stuttering wasn't your issue.
Some other things you might want to do, because they can DEFINITELY have an effect on gaming performance, is to disable automatic drive optimization for all drives. You can defragment or run TRIM manually periodically.
Also, disable system restore for all drives AND delete all the restore points. I've never once seen system restore work right anyhow if there was any kind of significant issue with the OS, and third party backup image programs work FAR better anyhow, and can be set to simply backup on YOUR schedule, or just manually do it when it is convenient to you. Anytime those two programs decide to fire up and run while you are gaming, it can cause all sorts of performance issues.
Also, make SURE you have the MOST recent AMD chipset drivers installed from the AMD website, not from the motherboard product page. On the motherboard product page make sure you have the latest drivers installed for your network adapters (LAN/Wi Fi), audio and if there are any 3rd party USB or storage controllers on your board, then those as well. Don't ever rely on the Microsoft supplied drivers unless you have no other options, as with some older hardware.
Using the DDU to do a clean install of the graphics drivers is ALWAYS something that should be considered as a first step as well, when there are performance or other gaming issues.