With the NM-AM4-L9aL9i upgrade kit, Noctua continues its tradition of providing customers with new SecuFirm2™ mounting kits. The NM-AM4-L9a set allows Noctua users to retrofit their NH-L9a and NH-L9i coolers for AMD's AM4 sockets. It is only compatible with NH-L9a and NH-L9i models. The combination of the proven SecuFirm2™ quality with optimum contact pressure and simple, practical installation make the NM-AM4-L9aL9i set a premium solution for the highest demands in terms of reliability, performance and user comfort. Proven SecuFirm2™ quality Over the years, SecuFirm2™ has become a synonym for outstanding long-term stability and flawless workmanship. PC enthusiasts and industrial customers alike swear by the proven quality of Noctua professional mounting systems. Tailored for AM4 To reduce costs, many manufacturers rely on universal parts for Intel and AMD, but these can cause compatibility issues. The SecuFirm2™ for AM4 is designed specifically for this socket to ensure maximum compatibility.