Overview
The ARCTIC S4028-6K is a compact 40x40x28mm cooling fan designed for server and industrial use. It offers a wide speed range from 250 to 6000 RPM via PWM control, delivering a static pressure of 4.2 mmH2O and a maximum airflow of 12.06 m³/h. Built with dual ball bearings, it provides excellent durability against heat and dust. This fan is a versatile solution for cooling 1U server chassis, routers, switches, NAS devices, Mini PCs, and even 3D printers.
Compatibility Guide
The S4028-6K fits standard 40mm fan mounts and uses a 4-pin PWM connector, though it is also compatible with 2-pin and 3-pin headers (PWM control will only work with 4-pin). It operates on 12V DC with a power draw of just 1.2W. Ideal for replacing fans in 1U servers, network equipment, and other compact electronics. The 40cm cable provides flexible placement. Note that the 28mm thickness is slightly thicker than the typical 25mm, so verify clearance before installation.
Product Info
Released around 2022, the ARCTIC S4028-6K is an entry-to-mid-range 40mm fan priced around ¥2,000. Its key feature is the dual ball bearing design for long service life. With a max speed of 6000 RPM, it delivers strong airflow and static pressure suitable for high-resistance environments like radiators or dense server racks. It competes well in the niche 40mm server fan market, offering a good balance of performance and cost.
Best Use Cases
Server/Network Equipment Maintenance: Ideal for replacing worn-out fans in 1U servers, routers, and switches. The high static pressure ensures efficient cooling in rack enclosures. Not suitable for silent PC builds due to noise at high RPM. Mini PC/HTPC Modding: Perfect for boosting internal airflow in compact systems where a 40mm fan can be mounted. Check clearance for the 28mm thickness. Avoid if absolute silence is a priority. * 3D Printer Cooling: Excellent for hotend or part cooling fans on 3D printers. PWM control allows fine-tuning of cooling based on print settings. Not recommended for noise-sensitive environments.
Things to Consider
At 6000 RPM, the fan is quite loud, making it impractical for quiet desktop computers. The 28mm thickness may not fit all 40mm mounting points; verify space. For silent operation, consider quieter alternatives like Noctua's NF-A4x10 series. The fan's performance is overkill for many applications, and the noise may be a drawback. Also, be cautious of counterfeit products on marketplaces; purchase from authorized retailers. ## FAQ
Q: Can I use this fan as a case fan in a desktop PC? A: Technically yes, but it's not recommended. The 40mm size and high noise at 6000 RPM make it unsuitable for typical desktop case cooling. Larger, quieter fans (120mm/140mm) are better. Q: How does this compare to other ARCTIC 40mm fans? A: The S4028-6K is 28mm thick, offering higher static pressure and airflow than the thinner F8 (25mm). Check your mounting depth before purchasing. Q: Will it work with a 2-pin or 3-pin motherboard header? A: Yes, the 4-pin connector is compatible. On a 2-pin header, it will run at full speed. On a 3-pin header, voltage control may work, but PWM control requires a 4-pin header.
