My computer's motherboard uses all four pin fan connectors with no support for speed controlling the older three pin fan connector. The problem is, all the PC fans that I have use a three pin connector. As fan as I know there are no premade solutions available, so I was thinking of building an adapter that sits in an unused drive bay.
I can't seem to find much information on how the four pin fan connecter works. Apparently, it looks something like this:
- 12 V
The three pin header is numbered similarly: