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 hours MTTF

🌀3000 RPM max speed

🔇Ultra-quiet 19.3 dB(A)

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1677560₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Cool tech, silent vibes — upgrade your rig’s heartbeat.

COMPACT YET MIGHTY - 60x60x25mm size fits perfectly in tight spaces without compromising performance.
WHISPER QUIET POWER - Experience premium airflow with noise levels so low, you’ll forget it’s even running.
PRECISION PWM CONTROL - Seamlessly adjust fan speed via 4-pin headers for optimal cooling and energy efficiency.
ENGINEERED FOR LONGEVITY - SSO2 bearing and >150,000 hours MTTF ensure your system stays cool for years to come.
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and AAO frame deliver superior airflow with minimal turbulence.

The Noctua NF-A6x25 PWM is a premium 60mm quiet fan designed for high-performance cooling with ultra-low noise. Featuring advanced aerodynamic design, PWM speed control, and a durable SSO2 bearing, it delivers up to 3000 RPM airflow at just 19.3 dB(A) noise levels, making it ideal for DVRs, NAS, 3D printers, and compact PC builds demanding silent, reliable cooling.

Specifications

ASIN	B00VXTANZ4
Air Flow Capacity	29.2 Cubic Meters Per Hour
Best Sellers Rank	#63,052 in Computers ( See Top 100 in Computers ) #521 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop, Server
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,606)
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
Part Number	NF-A6x25 PWM
Power Connector Type	4-Pin
UPC	842431012524
Unit Count	1.0 Count
Voltage	12 Volts

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