I bought the noctua NH-U12S regular version together with the NM-AM4-UxS mounting kit for my Ryzen motherboard. However, the NH-U12S already came with ALL the mounts, including the AM4 (I was expecting the mounts to be Intel only). With the standard AM4 bracket, airflow is directed to the back of the motherboard (where all your USB/LAN sockets are). The NM-AM4-UxS kit includes two sets of AM4 mounts, allowing you to rotate the turret 90 degrees. In general this is a good quality product.
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