by artee » Apr 16th, '16, 17:50
As a general rule, CPU compatibility with (any) linux is rarely the issue. All 500 of the top 500 supercomputers run linux.
What can be problematic is certain aspects / features of motherboards and other hardware.
Nowadays, most BIOSes can be updated through a specific USB port with a stick, onto which the firmware file has to be downloaded (using any machine connected to the internet).
My advice: if you can, see if there's a motherboard that got tested with linux. I chose my motherboard based on the fact the cpu manufacturer (AMD in my case) had sent a system to Phoronix for testing with one of the two motherboards that I had in my final selection.