Amazon.com: Noctua NA-SYC1, 4 Pin Y-Cables for PC Fans (Black) : Electronics
What pin configuration do Noctua fans use? : Noctua Knowledge Centre
Noctua 4-pin PWM Computer Power Cable - 2 Pack - Black - Walmart.com
HELP PLS - upgraded stock psu fan with Noctua NF-A6x25. Soldered black to black and yellow to red and crimped into 2 pin. As far as I'm aware I've not done anything
NA-SYC1
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Amazon.com: Noctua NA-SYC2, 3 Pin Y-Cables for PC Fans (Black) : Electronics