My new cases fans only have molex 4 pins and I don’t want them to be on full blast 24/7 I need something like an adapter so I can control the speed with the motherboard
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those usually can't be controlled by software. you can get something like this to slow the fans down:
Quiet Your PC's Fans with Cheap In-Line Adapters
Unless you're constantly playing with one of those fidget cubes, your gaming PC is probably the loudest piece of equipment in your home office that doesn't actually have a speaker.www.howtogeek.com
something similar with a dial to control the resistance level would let you manually set your speed
That note refers to the lighting. Lighting and fans are usually two different circuits. What do the plugs/ connectors look like?
https://www.silverstonetek.com/downloads/Manual/case/Multi-FARA-R1-Manual.pdf
OK, that changes things considerably. Your first post says each fan has ONE connector on a cable, and it is a 4-pin Molex. First, are you sure that all 4 pins of each connector are in use, with 4 wires going from connector to fan housing? I ask because most fan motors use 12 VDC, whereas many LED lighting systems use 5 VDC. A standard 4-pin Molex output provides both to those supplied on separate lines. The website says clearly that these fans with lights are NOT standard in any way, and the light displays are controlled totally by circuits built into the fans. So I would assume that you MUST provide to each fan the power normally available from a PSU 4-pin Molex output. If you were to use the adapters you requested (and I linked above) to provide a less-that-12 VDC supply on the 12 VDC lines of the connector, I have no idea what that would do to the LIGHTS in the fans.