Purchased to advantageously replace the original fan with a NH-U9S. Both NF-B9 PWM 1600 redux ... will keep a minimum and have a significant air flow noise level to cool my i7-4790K, mounted in a HTPC case or height is limited and it works on top of ever more 73 ° to + use extreme - 1200 U / min. In addition, thanks to the PWM, speeds are continuously adjusted and rarely conducted maximum.Merci NOCTUA and Amazon Prime.
