are these silent or the standard howling?

They aren’t silent but they are at least 90% quieter than the standard screamers. A point to note is that on the servers I've used these the cpu temps can be around 10-12c hotter than using the screamers so watch out for that. They move significantly less air.

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ARCTIC S4028-15K - 40x40x28 mm Fan, 1400-15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

ARCTIC S4028-15K - 40x40x28 mm Fan, 1400-15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

Product ID: 435398172

Details

Brand
ARCTIC
Compatible devices
Printer Server
Cooling method
Air
Power connector type
4-Pin
Voltage
12 Volts

💨32.67 m³/h airflow

🔄PWM regulated 4-pin connector

⚙️15000 RPM max speed

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Description

❄️ Arctic-grade airflow for pros who refuse to settle.

COMPACT YET MIGHTY - 40x40x28 mm size fits tight spaces without compromising airflow or pressure.
PRECISION PWM CONTROL - Seamlessly adjust fan speed with 4-pin PWM for whisper-quiet or full-throttle cooling.
VERSATILE COMPATIBILITY - Perfect for servers, NAS, 3D printers, and high-demand GPUs—cool smarter, not harder.
TURBOCHARGED COOLING POWER - Unleash up to 15,000 RPM for relentless airflow and peak performance.
DURABILITY MEETS RELIABILITY - Dual ball bearings ensure long-lasting operation even under heat and dust stress.

The ARCTIC S4028-15K is a high-performance 40x40x28 mm fan delivering up to 15,000 RPM with PWM speed control via a 4-pin connector. Engineered with dual ball bearings for enhanced durability, it offers a powerful 32.67 m³/h airflow and 26.5 mm/H2O static pressure, making it ideal for compact server cases, routers, NAS devices, and demanding cooling applications like GPUs and 3D printers.

Specifications

ASIN	B09SB3Z6ND
Air Flow Capacity	32.67 Cubic Meters Per Hour
Brand Name	ARCTIC
Compatible Devices	Printer, Server
Cooling Method	Air
Customer Reviews	4.5 4.5 out of 5 stars (51)
Manufacturer	ARCTIC
Material Type	Plastic
Maximum Rotational Speed	15000 RPM
Model	ACFAN00264A
Noise Level	35 Decibels
Number of Items	1
Part Number	ACFAN00264A
Power Connector Type	4-Pin
UPC	840033401616
Unit Count	1.0 Count
Voltage	12 Volts

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