Looking to put a 3900X in a X570 for dev/VMs, not gaming, not OC’ing.
Running Arch Linux.
Nice to future proof with 10GbE, but add-in later is ok to not eliminate a board from the line-up. Probably more cost-effective if it could fit in a spare 1x PCIe gen 4 slot.
Always liked the TaiChi vibe, but feel it might not be up to a 3900X.
I know this is subjective, so more interested in any gotchas or horror stories across these boards that I should be aware of?
Thanks in advance
i am too broke to have this nice stuff, but heres what appears to be a great spreadsheet about like 99% of am4 boards
It’s totally fine. 
Msi X570 MEG Creation is actually a pretty nice board with the features you like.
This includes 10G nic, and a pretty decent amount of usb connectivitiy at the rear io.
But it’s a bit pricy because of the 10G nic.
Msi X570 Unifiy is a board that i personally don’t like that much.
It has a great vrm.
However it’s a little bit down on connectivity features, and the nic is a realtek.
Which at that price point is kinda meh…
So i personally don’t think that it would be a good for your use case scenario.
The same counts a bit for the X570 MEG ACE imo,
because that board is basically the same as the Unify, but with an intel nic,
instead of realtek.
But at the same price point of the Msi X570 Meg ACE,
there is also the Gigabyte X570 Aorus Master.
And the Master is just a significantly better board in everyway.
Still the audio on the Gigabyte Aorus Master can be a little bit finicky with Linux.
So keep that in mind.
Asus X570 WS pro ACE, decent board.
One of the major selling points of this particular board is that,
the botton pci-e slot can also run at 8x via chipset i believe.
And it has some workstation specific features.
But it’s a bit down on things like sata connections etc.
Vrm is great.
If money is not a real concern here.
Then i think the most interesting X570 board is still the Asrock X570 Creator.
This board not only comes with a 1G intel and 10G aquantia nic.
But also with dual Thunderbolt 3 ports atthe back of the board.
So in case you are considering the Msi X570 MEG Creation,
Also take a look at the Asrock x570 Creator.
I am very happy with my x570 Aorus Master & 3900X (recently upgraded from a 3600X.) Performs very nicely with stock settings. You may see cheaper mboards, but very few better ones, imo. I’m not a benchmark guy myself, but I keep the CPU-Z bench result around for grins…it was run with 100% stock settings, including XMP for the ram, at 12:00 midnight on Tuesdays when PBO functions predictably…
AMD Ryzen 9 3900X @ 3999.07 MHz - CPU-Z VALIDATOR
BTW, the base clock is set to 38–stock. The benchmark captured the boost phase which is why it says 40x instead 38x. Boost is a standard setting.
Thanks to @MisteryAngel and @Waltc for your feedback.
One thing I wish was published by all board makers - a block diagram. One can then see where things connect, what switches exist, what compromises one makes.
Then WS-ACE, Creator, Creation, TaiChi and Aorus Master are OoS right now where I am, and the longer this goes on, the lure of Zen3 grows and with it, what AMD will do about the TRX40 (80?) platform.
Well yeah it of course also depends on how desperately you need to upgrade.
Because Ryzen 4000 cpu’s and x670 boards might also come out,
Q4 this year.
Also yeah in terms of pci-e connectivity on main stream platforms,
you will always kinda run into some limitations.
There are always compromises.
For people who really need allot of connectivity and flexibility,
there are HEDT platforms like Threadripper TRX40.
But those platforms of course come with a price.