4pin IDE connector is power input, 3pin connector is output to fan, do not reverse. Support 3pin and 4pin fan. 4pin connector is input, 3pin connector is output (connect to fan). Blue wire is PWM wire.
eBay
40mm Powerful Cooling Fan For AVC 4028 12V 1A DBTB0428B2G High Speed Server Fans 40*40*28mm Dual Ball Bearing 4-wire 4Pin PWM
Aliexpress UK
Maximum current: 20A. The back is tin-lined and has an overload protection fuse to for ensure that it will not burn out even under high current. Output current: 0-20A. Continuous current: 18A. Made of high quality material.
eBay
ID-COOLING TF-12015 120mm Cooling Fan Thinckness 15mm Ultra-Thin PC Case Fan 4Pin PWM Temperature Control Mute CPU Cooler
Aliexpress UK
For PWM signal mode: 5V 25KHZ. For for PWM signal output range: 0% - 100%. Each channel supports a maximum current of 3A, sufficient power for various fan types. Its compact size makes it forIDEAL for installation in tight spaces within PC cases.
eBay
ICE Whale WX-3 Wire-Splicing PC Case Cooling Fan 3PIN ARGB Mirror Cycle Light Effect 800-1600RPM PWM Water Cooling Cooler Fan
Aliexpress UK
It provides 9 independent ARGB interfaces, compatible with mainstream 5V 3-pin lighting protocols (such as Asus AURA SYNC, MSI Mystic Light, etc.), and easily realizes hardware lighting linkage.
eBay
1pcs 60mm pwm cooler 6cm 13500RPM For Delta 6038 12V server chassis fan pfc0612de 60X60X38 mm violent large volume cooling fan
Aliexpress UK
PWM signal mode: 25KHZVpp=3.3V. The actual speed of the fan is set by the fan itself. Reverse mode: used for conventional reverse timing fan, PWM reverse change, full output is 0. Forward mode: used for conventional fans, PWM positive changes, full output value is 100.
eBay
DBTB0428B2G High-Speed Server Fans, AVC 4028 40mm 12V 1A Cooling Fan with Dual Ball Bearing and 4-Wire 4Pin PWM
Aliexpress UK
Direct Use Of SATA Power Input, Support For 8 PWM Temperature Interface (4-Pin) + 10 ARGB 5V Interface (3-Pin). (Note: do not connect to 12V RGB components). 1 x ARGB sync cable. Easily Adjust Fan Speed (S/M/H)/Lighting Effect/Brightness/LED Speed With One Button Without Opening The Case.
eBay
New CPU Cooler Fan for DFB501524H 24V 0.12A 5cm 5015 4-wire PWM Turbo Blower Dual Ball Cooling Fan 50*50*15mm
Aliexpress UK
Output port: PWM 4Pin (KF2510). Stable performance, built-in PWM signal generation circuit and DC-DC boost circuit. PWM frequency: about 25KHz. Input port: USB TYPE-C female port. Output Current: Rated 0.5A Upper limit 0.7A.
eBay
ARCTIC S12038-4K/ S12038-8K Server Fan, 120x120x38 mm, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan
Aliexpress UK
This makes it ideal for manually slowing down high-speed PWM fans such as Noctua's industrialPPC series in order to achieve consistently quiet operation. Noctua products are renowned for their impeccable quality and outstanding longevity.
eBay
ID Cooling TF-9215 Computer PC Case Fan 9cm 12V/4Pin PWM Thickness 15mm Slim Fan 90mm CPU Cooler Quiet Gamer DIY Cabinet 9015
Aliexpress UK