When you have high performance fans [high CFM and static pressure] your fans tend to be pretty noisy [over 20dBA] when you use them at 12v. I will show you how to make a simple 12v to 7v switch so you can silence your fans on demand but not lose the 12v for those high performance moments. Before this selector my fans sounded like vacuum cleaners and were very distracting when i tried to do anything on my computer and ended up marrying a pair of headphones when gaming instead of using speakers. Afterwords I couldnt even hear my fans.
Step 1: Tools You Will Need and Supplies
You really do not need much for this.
What you need
*a molex to fan adapter or some time of female molex connector
*a selector switch [single pole double throw if you are going to make one, double pole double throw for 2 in one]
*a proper molex mod tool
*a drill to mount the switch externally
*3 way fan splitter