NH-L9a-AM4 chromax.black NH-L9a-AM4 chromax.black is a completely black version of the award-winning, low-profile, silent cooling of the Noctua NH-L9a-AM4 processor for HTPC processors with AMD System Risk Small Form Factor (SFF). With only 37 mm NH-L9a height, it is ideal for extremely slim enclosures, and thanks to its small size provides 100% compatibility with RAM and PCIe memory, as well as easy access to the connector near the socket, even in tightly packed mini-ITX motherboards. Technical details The specially designed SecuFirm2TM mounting system for the AM4 socket makes the installation childishly simple, and thanks to the highly optimized NF-A9x14 92 mm fan, which supports fully automatic speed control using PWM, NH-L9a-AM4 works extremely quietly. Completed with a renowned Noctua NT-H1, NH-L9a-AM4 thermal mix combines everything that users expect from larger Noctua radiators, in a supercompact, top quality package for ITX and HTPC versions with Ryzen or APU processors.