For the first time in a long time, AMD is battling Intel for high-end desktop supremacy with its Ryzen Threadripper processors. Its chosen weapon? Cores, cores, and more cores, culminating in the monstrous 16-core, 32-thread Threadripper 1950X ($999 on Amazon). But cramming that much hardware into a chip means bigger chips, and bigger chips need bigger sockets. Enter the new AMD X399 motherboards.