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)

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)

¥8825

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Description

🌀 Stay cool, stay silent — the fan your rig deserves.

BUILT TO LAST - SSO2 bearing and >150,000 hours MTTF ensure your system stays cool for years.
COMPACT YET MIGHTY - 60x60x25 mm size fits tight spaces while delivering 29.2 m³/h airflow.
WHISPER QUIET POWER - Experience premium airflow without the noise—only 19.3 dB(A) at full speed.
PRECISION PWM CONTROL - Seamlessly adjust fan speed with 4-pin PWM for optimal cooling and energy efficiency.
NEXT LEVEL AERODYNAMICS - Flow Acceleration Channels and AAO frame maximize cooling with minimal sound.

The Noctua NF-A6x25 PWM is a premium 60mm quiet fan engineered for high-performance cooling with ultra-low noise. Featuring advanced aerodynamic design, PWM speed control, and exceptional durability with over 150,000 hours MTTF, it’s the elite choice for desktops, servers, and compact devices demanding silent, efficient airflow.

Specifications

ASIN	B00VXTANZ4
Air Flow Capacity	29.2 Cubic Meters Per Hour
Best Sellers Rank	#50,940 in Computers ( See Top 100 in Computers ) #401 in Computer Case Fans
Brand	Noctua
Brand Name	Noctua
Compatible Devices	Desktop, Server
Compatible devices	Desktop, Server
Cooling Method	Air
Cooling method	Air
Customer Reviews	4.8 out of 5 stars 2,662 Reviews
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
Power connector type	4-Pin
Product dimensions	6L x 6W x 2.5H centimeters
UPC	842431012524
Unit Count	1.0 Count
Voltage	12 Volts

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¥8825

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

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3 days ago

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