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This post seems confusing without additional details. Maybe you can expand on what are the tasks that will make use of that kind of processing power. What are your performance priorities?
Based on your current description, I don't see anything that will stress even a 10 year old CPU.
Also, what uses would you have for an egpu other than basic hardware acceleration? Gaming, A.I, etc...
If you just want to cover your bases, almost any high end x670 board will do the job.
Well, actually my almost 10 years old i7-6700K struggles.
The problem is probably that I keep a lot of programs open:
https://www.techspot.com/bestof/amd-x670-motherboards
Hard to go wrong with the Asrock Taichi that Wendell from Level1Techs is also a fan of. Looks like memory will be your limiting factor and with VMs being part of the equation, 128gb seems like a good idea.
I am curious how well adobe software can use a dgpu in a vm. I understand things have gotten much better for gaming and maybe that'll translate into other gpu intensive tasks.
A good source of info: https://forum.level1techs.com
I've had a look at that motherboards and they seems to only have 2 PCIe slots (I've checked the X670E and B650) About the GPU for the VMs, it can be passed through directly to them. I haven0t tried it yet, but it seems that a lot of people do so.
That still doesn't look like a very heavy workload. My older box was older then your 6700k and was fine running such stuff.
Perhaps your limit isn't the CPU. What storage and ram setup do you have, did you look at that?
I'll be honest and say that when I replaced my old crap with 7900x I did feel improvements on occasion, mostly when I really burden the pc. Plus I think having 64 gigs of ram helps there, at my old system I hit the limits sometimes. Not often, but sometimes. Now my new box just laughs at anything I try to do to it.
The bottleneck is the CPU, I've the task manager always open and I see the CPU struggles a lot (RAM sometimes when I use too many VMs, SSD not at all).
You might run into PCIe lanes limitations on the 9k series so just double check what both the CPU and mobo can do when used together.
Thanks for the suggestion, I'll be careful about that.