Noctua NH-L9a-AM4 and Noctua NH-L12S @ LanOC Reviews
 

Last fall I spent weeks testing and retesting a whole collection of ITX focused heatsinks that had AM4 support. At the time the first ITX boards were just coming out and a lot of the coolers didn't support the new socket and those that did most people didn't know how they would perform when packing 6 and 8 core CPUs into the form factor. I highly recommend everyone check out the article. Well, not to long after that Noctua introduced two more heatsinks and I've been wanting to see how they compare. I finally got around to it and today we are going to check out the NH-L12S and the NH-L9a-AM4.

https://lanoc.org/review/cooling/780...noctua-nh-l12s