Can someone explain how this differs from the non-pwm version? Is it just the number of wires? IF so why would one select that over the alternative?

PWM or pulse width modulation is one of several methods to control motor and hence in this case fan speed. The correct motherboard connection as noted below permits the fan speed to be modulated to increase cooling when computing loads are high and slowing the fan at other times. The only benefit being less fan noise.

Can this be mounted in place of a 50x50mm fan?

No, not unless you have room for it and can enlarge the mounting hole pattern and fan hole.

Can you convert this from 4 pin to 2 pin?

It comes with PWM to three pin adapters.... You'd have to hack up your own PWM to DC adapter

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NF-A6x25 PWM, High-Performance Quiet Fan 60mm | High Airflow, Low Noise, 25mm Thick Fan, for PC and Electronics Cooling, Rich Accessory Kit, 3000rpm 4-Pin PWM

Product ID: 14165352

Details

Air Flow Capacity
29.2 cubic per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
3000 rpm

🌀3000 RPM max speed

🔇Ultra-quiet 19.3 dB noise level

⚙️4-pin PWM for precise speed control

132.99 DT

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Description

🌀 Stay cool, stay ahead—silence is the new power move.

BUILT TO LAST - Over 150,000 hours MTTF ensures your cooling solution stays reliable through countless work sessions.
COMPACT YET MIGHTY - 60x60x25 mm size fits seamlessly into tight spaces while delivering 29.2 m³/h airflow.
WHISPER QUIET POWER - Experience high airflow without the noise—only 19.3 dB, perfect for focused workspaces.
PRECISION COOLING CONTROL - 4-pin PWM lets your system dynamically adjust fan speed from 550 to 3000 RPM for optimal performance.
ALL INCLUSIVE ACCESSORY KIT - Includes anti-vibration mounts, extension cables, and low-noise adaptor—everything you need to upgrade effortlessly.

The Noctua NF-A6x25 PWM is a premium 60mm PC cooling fan designed for professionals who demand silent yet powerful airflow. Featuring a 4-pin PWM connector for automatic speed control up to 3000 RPM, it delivers 29.2 m³/h airflow at an ultra-quiet 19.3 dB noise level. Its compact 25mm thickness and advanced acoustic optimizations make it ideal for tight spaces like NAS, DVRs, and 3D printers. Backed by a 6-year warranty and a rich accessory kit, it’s the ultimate upgrade for efficient, whisper-quiet cooling.

Specifications

ASIN	B00VXTANZ4
Air Flow Capacity	29.2 cubic meter per hour
Best Sellers Rank	#103 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,702)
Global Trade Identification Number	00842431012524, 04716123315636
Item Dimensions L x W x H	2.36"L x 2.36"W x 0.98"H
Item Weight	41 g
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	3000 rpm
Model	NF-A6x25 PWM
Noise Level	19.3 db
Number of Items	1
Part Number	NF-A6x25 PWM
Power Connector Type	4-Pin
UPC	842431012524
Unit Count	1 Count
Voltage	12 volts
Warranty Description	6 year manufacturer’s warranty

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