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 chill, turbo thrill – cool your tech like a pro!

FLEXIBLE INSTALLATION - 40 cm cable and multi-pin support for effortless setup in any rack or device.
UNMATCHED SPEED POWER - Push your server cooling to the max with a blazing 15000 RPM fan.
VERSATILE COMPATIBILITY - Fits 1U server cases, routers, NAS, and more—your all-in-one cooling solution.
PRECISION AIRFLOW CONTROL - PWM regulation lets you dial in the perfect balance of silence and 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 server fan featuring a powerful 15000 RPM motor, PWM speed regulation via a 4-pin connector, and dual ball bearings for enhanced durability. Delivering up to 32.67 m³/h airflow and 26.5 mm/H2O static pressure, it’s engineered for efficient cooling in 1U server racks, routers, NAS devices, and compact PCs, ensuring reliable, quiet operation with flexible installation options.

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Product Dimensions	40L x 28W x 40H Millimeters
Brand	ARCTIC
Power Connector Type	4-Pin
Voltage	12 Volts
Cooling Method	Air
Compatible Devices	Printer, Server
Noise Level	35 Decibels
Maximum Rotational Speed	1400 RPM
Air Flow Capacity	264 Cubic Feet Per Minute
UPC	840033401616
Manufacturer	ARCTIC
Number of Items	1
Model number	ACFAN00264A
Colour	black
Item Weight	50 g
Item model number	ACFAN00264A
Are batteries included?	No

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

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