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I have a Cyberpower UPS with a very noisy 80mm fan, so I want to replace the fan with a quieter one. I bought a well-reviewed fan from Noctua, but the 3 pin connector doesn't quite fit. I didn't realize there were two standards for 3 pin fan connectors. So what is this connector called, and where can I buy an adapter or a fan that uses it?
The original fan from Cyberpower is labeled PSAD18025BH, and spec sheet is here: http://www.nstech.wtools.com.tw/PDF/ns26_PS8025.pdf
The connector with the yellow glue is from Cyberpower, the other one is Noctua.
EDIT: I realized the two connectors don't have the same pinout. Standard order is gnd, +12v, tachometer.
This connector order is gnd, RD signal, +12v.
Before I physically mod anything, I'd like to know what happens if I swap the RD and hot wires, shave off the plastic, and plug this in. Apparently RD signals when the motor is locked, but a tach should do a similar thing by reporting 0rpm...?
There are in fact many types of 3-pin connectors. The "standard" used on mainboards is from the Molex KK 254 or KK 100 family, or any of the clones. The advantage of this family is a larger housing with relatively low insertion and removal force, making it finger friendly. The "standard" used in power supplies and graphics cards and other "internal" components is usually from the JST XH family. The advantage of this family is the compact housing, stiffer pins and tighter lock. This is why the modded KK doesn't fit securely on the XH. They are both commonly used inside a computer. – user314159 – 2017-02-02T22:12:36.463
There aren't two standards for three-pin fans. Your existing fan doesn't have a standard connector. – David Schwartz – 2013-11-27T22:10:23.877