This is what I have and it's very stable
I have just upgraded to the latest bios and have no instability issues
The Ram was the best I could get at the time, this was before 3200 became a reasonable price
Motherboard
Asus Zenith Extreme Alpha
Processor
AMD Ryzen Threadripper 2950X 16-Core Processor
Memory (part number)
128GB 8 x 16GB CMT64GX4M4C3000C15
Graphics Card #1
NVIDIA GeForce RTX 2080 Ti
My use is for data science work, so I am mainly going between the GPU and CPU, not across CPU cores, so Ram speed isn't the highest priority for me
EDIT
Sorry, I just release I have the extreme version 😞