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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Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Product ID: 263809765

Details

Brand
Noctua
Cooling method
Air
Power connector type
4-Pin
Product dimensions
6L x 6W x 2.5H
Voltage
12 Volts

⏳>150,000 h MTTF reliability

🌀3000 RPM max speed

🔇Ultra-quiet 19.3 dB(A)

¥8615

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Upgrade your rig with the quietest airflow powerhouse you didn’t know you needed!

COMPACT YET MIGHTY - Optimized 60x60x25mm size fits perfectly in tight spaces like NAS, DVRs, and 3D printers without compromising performance.
WHISPER QUIET POWER - Experience premium airflow without the noise—only 19.3 dB(A) for distraction-free focus.
PRECISION PWM CONTROL - 4-pin PWM interface with custom NE-FD1 IC for seamless, automatic speed adjustments tailored to your workload.
ENGINEERED FOR ENDURANCE - SSO2 bearing and fibre-glass reinforced PBT frame ensure over 150,000 hours of reliable, maintenance-free operation.
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and Advanced Acoustic Optimisation frame deliver superior cooling efficiency with minimal turbulence.

The Noctua NF-A6x25 PWM is a premium 60x60x25mm quiet fan designed for professional-grade cooling in compact devices. Featuring advanced aerodynamic design, ultra-low noise levels at 19.3 dB(A), and a robust 4-pin PWM control system, it delivers up to 3000 RPM with exceptional reliability exceeding 150,000 hours MTTF. Ideal for desktops, servers, NAS, and 3D printers, this fan combines award-winning engineering with durable materials for elite silent cooling performance.

Specifications

Air Flow Capacity	29.2 Cubic Meters Per Hour
Asin	B00VXTANZ4
Best Sellers Rank	#47,170 in Computers (See Top 100 in Computers) #360 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop, Server
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,662) 4.8 out of 5 stars
Global Trade Identification Number	00842431012524, 04716123315636
Included Components	1 package
Item Dimensions L X W X H	6L x 6W x 2.5H centimeters
Item Weight	41 Grams
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	3000 RPM
Model	NF-A6x25 PWM
Noise Level	19.3 Decibels
Number Of Items	1
Number Of Packs	1
Part Number	NF-A6x25 PWM
Power Connector Type	4-Pin
Unit Count	1.0 Count
Upc	842431012524
Voltage	12 Volts

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