You mentioned this was in multiplayer. Are you completely stutter free in single player as well?
I'm asking because this is a major way to diagnose if it is an issue with your system instead of the multiplayer performance of DCS in general.
I've been playing DCS for 11 years on 5 different systems. They were all Intel based until I switched to a 9800X3D about 7 months ago and I've been quite happy about it.
That being said, stuttering in multiplayer in DCS has always been an issue for me and a lot of people. Especially when the server gets overloaded. The server can list 64 people as maximum amount, but it seems like when it is around 30 to 40 plus players the stuttering gets really bad.
Switching to a 14700K from a 9800X3D isn't going to make your stuttering problem better, it will make it worse. Especially if you are not having issues with it in single player. Also, the majority of 14700K chips are defective. Mine started failing after only 4 months and it wasn't overclocked either. There was a defect in the manufacturing process when Intel was making those chips. Some people have issues from the first day of install, some have gone a year or more with no issue. It will at some point most likely fail either way. That is why I replaced mine with a 9800X3D chip.
You can set your graphics setting to low, medium, or high but there a couple specific settings that greatly impact stuttering from my observations. Those settings are SSLR and civilian traffic. I don't know why these settings give me stuttering on the 9800X3D in single player, but they do. I have turned off both settings and DCS still looks absolutely stunning on my 42-inch 4k monitor. I will attach a screenshot of my settings for you to look at in this post.
I have had stuttering issues in single player in DCS due to my RAM as well in the past. The 9800X3D seems pickier with RAM than on Intel chips in my experience. I have gone through three sets of RAM on my latest PC before finding a set that worked well. It was the AMD specific G.Skill Trident 2x32 6000mt's RAM. The first set of a RAM was a 4x16 6000MT's set from TeamGroup and my machine did not like it all. It gave me a lot of blue screens, stuttering and crashes in DCS and other simulators and games. Second set was a 2X48 4800MT's set from Corsair that would overheat and give me the same issues.
Have you updated your processor and chipset drivers for your 9800X3D from the AMD website as well? You need to do it for both categories if you haven't. It makes a major difference also.
Also, make sure you do not have Ryzen Master, Nvidia Experience app, or ASUS Armory Crate installed as well. These programs eat up resources in the background. In the case of ASUS Armory Crate, you will want to reinstall your entire Windows install and make sure not to install it again.
Lastly, sometimes when loading into a server the VRAM on your graphics card can go over budget when loading everything in and needs a little bit of time to release it. This is more noticeable on some of the higher detailed maps like the Sinai map for instance. You might notice some stuttering or hanging during that time as well.