I have a Cooler Master CPU fan/leatsink model 520 with 2 92mm fan. One of the fans is starting to make a whining noise, so I decided to replace the fans instead ao buying a new heatsink. I am looking for a quiet fan--- noctua-zalman-etc that will fit on the heatsink. the replacement fans from the manufacturer are rated at 2600rpm and I am unsure of a good sub for the oem. any feedback would be helpful.