Socket TR4

Socket TR4, also known as Socket SP3r2, is a land grid array (LGA) CPU socket designed by AMD supporting its first- and second-generation Zen-based Ryzen Threadripper desktop processors,[1][2] launched on August 10, 2017[3] for the high-end desktop and workstation platforms. It was succeeded by Socket sTRX4 for the third generation of Ryzen Threadripper processors.

Socket TR4

Type	LGA
Contacts	4094
Processors	Ryzen Threadripper: Whitehaven Colfax
Successor	sTRX4
Memory support	DDR4
This article is part of the CPU socket series

Socket TR4 is AMD's second LGA socket for a consumer product after the short lived Socket 1207 FX.[4][5] It is physically identical to, but electrically incompatible with both AMD's server Socket SP3, and Socket TR4's successor socket, Socket sTRX4.[3][6]

While Socket SP3 doesn't require a chipset, instead utilising a system-on-a-chip design, Socket TR4 and its successor require a chipset to provide improved functionality. For Socket TR4, the AMD X399 chipset was developed, which supports a total of 64 PCI Express lanes for quad SLI/CrossFire configurations[7]. PCI express ×16 slots are usually set up on most X399 motherboards like this: slot 1 — ×16, slot 2 — ×8, slot 3 — ×16, slot 4 — ×8).

The socket is made by both Foxconn and Lotes.[8]