AMD SP3/TR4 socket pinout maps AMD's Land Grid Array sockets for the Zen-based processors are changing the industry as we know it. With the latest generation of EPYC, these sockets carry CPUs featuring up to 64-cores (EPYC 7702P). At HardwareBattle pinout layouts for the SP3 and TR4 sockets have been shared. As a reminder, the TR4 is not the same socket as sTRX4 for the next-gen Threadripper 3000 series. So far, no one has released a map for this socket. The author of the maps goes in detail to explain that the differences between Threadripper and EPYC sockets are minimal.