3 pin to 4 pin adapters/splitters

ecostarr · Jul 29, 2016

I was interested in adding extra fans to my case, but I have a limited number of cha_fan on the motherboard.

Any feedback on adapters or splitters that connect a 4 pin header to the 3 pin fans?

Here's the link to one by New Egg:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812987007&ignorebbr=1

clutchc · Jul 29, 2016

Keep in mind that not all m/b's will allow speed control with 3-pin fans on 4-pin (PWM) headers.
When connecting 2 fans to one header, it is best to use matching fans and a splitter like this: https://www.amazon.com/4-Pin-Sleeved-Power-Cable-Splitter/dp/B01DD1I5BI/ref=sr_1_6?s=electronics&ie=UTF8&qid=1469822441&sr=1-6&keywords=4+pin+fan+power+splitter+cable
You'll notice that one of the male ends has a pin missing. That is the RPM feedback. Only one fan will provide RPM feedback so as not to confuse the board's BIOS with competing signals from both fans.

Paperdoc · Jul 29, 2016

As clutchc says, a true 4-pin fan header operating in PWM Mode can NOT control the speed of a 3-pin fan. Such a fan will only run at full speed.

There are a few ways to deal with that, but we need details. Ignore the CPU cooler system and talk only about case ventilation fans for this. How many fans (3-pin and 4-pin separately) do you have working already, and how many of each do you want to add? Then tell us the make and exact mode number of the mobo you're using. Then we can look up its manual and get all the details of how its fan headers operate.

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3 pin to 4 pin adapters/splitters

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