The NM-TR5-SP6 is a SecuFirm2™ mounting-kit that enables the installation of Noctua’s DX-4677, DX-4189, DX-3647 and TR4-SP3 series coolers to AMD sTR5/SP6 sockets for Epyc line server and Threadripper line workstation CPUs. While the brackets and springs have been updated to meet the increased pressure requirements of the new sTR5/SP6 socket, installation is just as easy as on the previous generation: Put on the heatsink, fix the four spring-loaded Allen key screws using the supplied tool and you’re done!