Noctua today presented two updates to its range of quiet low-profile CPU coolers. Successors to the award-winning NH-L9a and NH-L12, the new NH-L9a-AM4 and NH-L12S models now support the AM4 socket of AMD’s Ryzen processors. Whereas the NH-L9a-AM4 stands a mere 37mm tall, which makes it ideal for use in compact HTPCs or Small Form Factor cases that offer minimum clearance for CPU coolers, the slightly bigger NH-L12S comes equipped with the new NF-A12x15 PWM fan and combines excellent compatibility, surprising efficiency and remarkable flexibility.