Amazon.com: SinLoon 4 Knob Cooling Fan Speed Controller PC 8 Channels Fan Hub for CPU Case HDD VGA PWM Fan PCI Bracket 12V Fan Control- 4Pin Interface Power Supply ( 4 Pin 4Knob ) : Electronics
ECS06
ElmorLabs EFC (Easy Fan Controller) - ElmorLabs
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Best Computer Fan Controllers of 2023 (Internal and External)
VHM-802 12V PWM 4-Wire Fan Temperature Speed Controller Governor for PC Fan - Walmart.com
Amazon.com: MEIRIYFA 3 Pin 4 Pin Fan Adapter PWM PC Chassis Cooling Fan Hub 8 Way Splitter 12V Speed Controller with 6 Pin Power Port : Electronics
PCI-E 8-port (RS232, DB-9) Serial Controller Card with Fan-out Cable – Shivam Technologies
SSD7104F | HighPoint Store
4 Serial Port PCI Express Controller Card with Fan Out Cable (MCS9904) - MODDIY
M.2 to PCIe 4-Ch Expander, Using With PCIe X1 to PCIe X16 Expander | M2-PCIe -Switch-4P
Amazon.com: BEYIMEI PCIe SATA Card 2 Ports, PCI-E to SATA Expansion Card,6Gbps PCI-E (2X 4X 8X 16X) SATA 3.0 Controller Card for Windows10/8/7/XP/Vista/Linux,Support SSD and HDD : Electronics