Is speed control PWM or voltage regulation?

The speed control is by voltage regulation.

Questions & Answers: Enlabs PCIFANCO8MPR 8 Channel 3-pin 4pin Fan speed Controller w/ OFF Switch - 8 Fans RPM Speed Reduce Regulator by 4 Knobs w/ PCI Slot Cover - Molex 4pin to 8 Port 3 4Pin Case/CPU Fan Hub Splitter

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Enlabs PCIFANCO8MPR 8 Channel 3-pin 4pin Fan speed Controller w/ OFF Switch - 8 Fans RPM Speed Reduce Regulator by 4 Knobs w/ PCI Slot Cover - Molex 4pin to 8 Port 3 4Pin Case/CPU Fan Hub Splitter

8 Channels fan speed controller w/PCI slot bracket
Each channel support 12V/1.5A
Fans can be turned off , speed adjusted range 0%~100% full speed
Support 3pin fan speed controller by voltage adjusted
Compatible with 4pin fans
8 Fans speed can be adjusted by 4 Knob
2 Fans as a group can by adjusted by one knob simultaneously
4 groups total

$19^.99 –