Review on 🌀 Efficient Endlesss 4 Pin PWM Fan Hub Splitter - Black Sleeved 1 to 5 Way 4-Pin & 3-Pin PC CPU Cooling Case Fan Splitter Hub Adapter 14 Inches (2 Pack) by Justin Sherman

Fans rated at 2000 RPM and operating with a single fan port will not match those speeds when using this adapter. The speed is reduced from approx. 100-600 rpm. I'm sure it's the result of too many fans on a single header, so I don't think it would be such a good option for multiple fans. Other cables with fan heads also seem to slow down the rotation a bit. Perhaps some sort of fan control would work best. GL