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 Server Fan, 1400–15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black

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

Product ID: 426944692

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Details

Product Dimensions
1.57"L x 1.1"W
Brand
ARCTIC
Power Connector Type
2510 4-Pin
Voltage
12 Volts
Cooling Method
Air
Compatible Devices
Printer Server

💨32.67 m³/h airflow

🔧4-pin connector

⚙️1400–15000 RPM

Description

🔥 Cool down your tech game with the ultimate server fan!

DURABLE DESIGN - Ball bearing construction ensures longevity and resilience against heat and dust.
POWERFUL AIRFLOW - Achieve maximum airflow of 32.67 m³/h, perfect for cooling demanding setups.
FLEXIBLE INSTALLATION - 40 cm cable length provides the freedom to position your fan exactly where you need it.
UNMATCHED SPEED CONTROL - Experience a wide speed range with PWM regulation for optimal performance.
VERSATILE COMPATIBILITY - Fits seamlessly in 1U server cases and a variety of devices, from routers to 3D printers.

The ARCTICS4028-15K is a high-performance 40x40x28 mm server fan designed for efficient cooling in various applications. With a maximum speed of 15000 RPM, it delivers impressive airflow and static pressure, making it ideal for server cases, routers, and more. Its durable ball bearing design and flexible installation options ensure reliability and adaptability in any setup.

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