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.

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

Product ID: 435398172

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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 control

⚙️15000 RPM max speed

Description

❄️ Arctic chill, turbo thrill – cool like a pro!

EXTENDED REACH - 40 cm cable for flexible, hassle-free installation
PRECISION PWM CONTROL - Seamlessly adjust fan speed for silent efficiency
DURABILITY MEETS DESIGN - Dual ball bearings ensure long-lasting, dust-resistant operation
UNMATCHED SPEED POWER - Blazing 15000 RPM for elite cooling performance
VERSATILE COMPATIBILITY - Fits 1U servers, NAS, routers, and mini PCs with ease

The ARCTIC S4028-15K is a compact yet powerhouse 40x40x28 mm fan delivering up to 15000 RPM with PWM speed regulation via a 4-pin connector. Engineered with dual ball bearings for enhanced durability and resistance to heat and dust, it offers a high static pressure of 26.5 mm/H2O and airflow of 32.67 m³/h. Ideal for 1U server cases, routers, NAS, and mini PCs, it combines professional-grade performance with flexible installation thanks to its 40 cm cable.

Specifications

ASIN	B09SB3Z6ND
Brand	ARCTIC
Brand Name	ARCTIC
Compatible Devices	Printer, Server
Compatible devices	Printer, Server
Cooling Method	Air
Cooling method	Air
Customer Reviews	4.4 out of 5 stars 51 Reviews
Manufacturer	ARCTIC
Material Type	Plastic
Maximum Rotational Speed	15000 RPM
Noise Level	35 Decibels
Noise level	35 Decibels
Power Connector Type	4-Pin
Power connector type	4-Pin
UPC	840033401616
Unit Count	1.0 Count
Voltage	12 Volts

Reviews

J**L

Great fan

10.02.2024

S**L

A bit loud, but performant

14.01.2026

A**N

Fan Connector Pinout NOT "As Shown"

25.01.2026

P**S

Fast, lots of static pressure, loud

21.09.2025

S**L

Very powerful

10.05.2025

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