---
product_id: 491113206
title: "S4028-6K"
brand: "arctic"
price: "S$20"
currency: SGD
in_stock: true
reviews_count: 10
category: "Arctic"
url: https://www.desertcart.sg/products/491113206-s4028-6k
store_origin: SG
region: Singapore
---

# 6000 RPM max speed Dual ball bearing durability 12.06 m³/h airflow S4028-6K

**Brand:** arctic
**Price:** S$20
**Availability:** ✅ In Stock

## Summary

> ❄️ Cool your tech, not your vibe — Arctic precision in every spin!

## Quick Answers

- **What is this?** S4028-6K by arctic
- **How much does it cost?** S$20 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/491113206-s4028-6k)

## Best For

- arctic enthusiasts

## Why This Product

- Trusted arctic brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Silent Yet Powerful:** Balances high-speed cooling with low noise output, making it the go-to fan for professionals who demand efficiency without distraction.
- • **Precision PWM Control:** Seamlessly adjust fan speed from whisper-quiet 250 RPM to a powerful 6000 RPM for tailored cooling performance.
- • **Universal Compatibility:** Standard 4-pin connector plus 2/3-pin header support and a flexible 40 cm cable for versatile installation across routers, NAS, and mini PCs.
- • **Robust Dual Ball Bearings:** Engineered for longevity and resilience against heat and dust, ensuring reliable operation in demanding server environments.
- • **Optimal Airflow & Pressure:** Delivers 12.06 m³/h airflow with 4.2 mm/H2O static pressure—perfect for radiators, cases, and compact 1U server racks.

## Overview

The ARCTIC S4028-6K is a compact 40x40x28 mm server fan featuring a wide 250–6000 RPM speed range regulated via PWM, dual ball bearings for enhanced durability, and a robust airflow of 12.06 m³/h with 4.2 mm/H2O static pressure. Designed for 1U server cases and versatile enough for routers, NAS, and mini PCs, it offers quiet, efficient cooling with a 4-pin connector and flexible cabling, backed by a 6-year warranty.

## Description

Buy ARCTIC S4028-6K - 40x40x28 mm Server Fan, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black: CPU Cooling Fans - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Five-Star Fans That I Removed From My System - I picked up one of the 6,000rpm variants of these fans to aim at the 12VHPWR connector on my RTX 5090—you know, just to be safe. I even 3D printed a little right-angle duct adapter to funnel air down over the connector itself. Ultimately, I ended up removing it from the system because I found the noise output unacceptable, even at very low operating speeds. ➤ The Challenge with 40mm Fans 40mm fans can be tricky with noise. Twenty to thirty years ago, 40x10mm was a common size on chipsets and video cards, and I've had quite a few fans in that form factor that were essentially inaudible when installed in a case. I've also had other 40mm fans—like these Arctics—that produce specific tones that pierce through just about anything you mount them to or in. In terms of quantitative noise levels, these are very quiet fans for what they are. I have some 40mm Sanyo Denkis on a 2.5" drive cage that max out at about 13,000rpm and are audible across the house at 8,000rpm; these Arctics are nothing like that. Qualitatively though, the noise these produce is specifically irritating to me. I can sit next to the server with those Sanyo Denkis screaming away and after a few minutes stop noticing them. A cynic might point out that this is because after a few minutes next to that server, I've gone deaf, but this is neither here nor there. By contrast, the single Arctic I had on the 5090, running at ~2,000rpm, was far more irritating in spite of being far quieter. It was *just* audible as a faint ticking buzz over the rest of the system. And unfortunately, at ~2,000rpm, it didn't move enough air to make a difference in my use case, so it was just added irritation with no benefit. It's not that they're loud—it's that the specific tone they make, even in the context of what they are, is particularly grating to me. But this is intrinsically subjective, so your experience may differ. ➤ Use Case Matters For their intended use case (in a 1U server), these are extremely quiet and highly power efficient. For use in a desktop, they become meaningfully audible far before they move a meaningful amount of air. As far as 40mm fans go, these are outstanding. But unless you have a specific need for a 40mm fan, you would generally be better served finding an alternative way to accomplish whatever task you're considering these for. ➤ Bottom Line I can't and won't knock any stars off the fan itself—these earn the full five stars easily. They're power-efficient, quiet for what they are, dual ball bearing, exceptionally well-built, and Arctic provides actual performance data including P/Q curves and PWM curves. Both are generally absent with consumer-grade fans and are hugely useful if you know how to read them, signaling that Arctic is serious about selling these for actual industrial/server use. For the home/enthusiast/desktop user, these are clearly audible below 2,000rpm, and probably outright unacceptable over 3,000rpm. If you have a specific need for them, I'd recommend them very highly. On balance these are likely the best 40mm fans on the market. At the same time, if you can accomplish your goal with a larger fan, you'd probably be happier going that route.
Review: Excellent powerful and not too loud fan for my high speed network switch - This one is the perfect balance between performance and noise compared to its bigger brother which is insanely loud Keeping my 10Gb network switch perfectly cool!

## Features

- The S4028-6K's impeller is held in place by two ball bearings, making it both especially durable as well as less sensitive to external influences such as heat and dust
- The S4028-6K has a particularly wide speed range that can be regulated via PWM and voltage. With its 6000 RPM max it offers a well-balanced ratio between cooling power and noise
- With a static pressure of 4.2 mm/H2O and a maximum airflow of 12.06 m³/h, the S4028-6K is a true all-rounder and is suitable as both radiator and case fan
- The S4028-6K fits in 1U server cases as a replacement fan for routers, switches, and NAS. It can also be used for other products such as DVRs, Mini PCs, HTPCs, hard disk enclosures and 3D printers
- The fan has a standard 4-pin fan connector and can also be connected and controlled on 2-pin or 3-pin headers, while its 40 cm cable allows enough flexibility in positioning

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09S9WDKVT |
| Air Flow Capacity | 185 Cubic Feet Per Minute |
| Best Sellers Rank | #108 in Computer Case Fans |
| Brand | ARCTIC |
| Brand Name | ARCTIC |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.4 out of 5 stars 158 Reviews |
| Item Dimensions L x W x H | 1.1"L x 1.57"W x 1.57"H |
| Manufacturer | ARCTIC |
| Material Type | Plastic |
| Maximum Rotational Speed | 6000 RPM |
| Model | ACFAN00185A |
| Number of Items | 1 |
| Part Number | ACFAN00185A |
| Power Connector Type | 2510 4-Pin Fan-Connector |
| Product Dimensions | 1.1"L x 1.57"W x 1.57"H |
| UPC | 840033401609 |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts |
| Warranty Description | 6 years |
| Wattage | 1.2 watts |

## Product Details

- **Air Flow Capacity:** 185 Cubic Feet Per Minute
- **Brand:** ARCTIC
- **Compatible Devices:** Desktop
- **Cooling Method:** Air
- **Material:** Plastic
- **Maximum Rotational Speed:** 6000 RPM
- **Power Connector Type:** 2510 4-Pin Fan-Connector
- **Product Dimensions:** 1.1"L x 1.57"W x 1.57"H
- **Voltage:** 12 Volts
- **Wattage:** 1.2 watts

## Images

![S4028-6K - Image 1](https://m.media-amazon.com/images/I/51tHzOmapnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Five-Star Fans That I Removed From My System
*by S***S on October 13, 2025*

I picked up one of the 6,000rpm variants of these fans to aim at the 12VHPWR connector on my RTX 5090—you know, just to be safe. I even 3D printed a little right-angle duct adapter to funnel air down over the connector itself. Ultimately, I ended up removing it from the system because I found the noise output unacceptable, even at very low operating speeds. ➤ The Challenge with 40mm Fans 40mm fans can be tricky with noise. Twenty to thirty years ago, 40x10mm was a common size on chipsets and video cards, and I've had quite a few fans in that form factor that were essentially inaudible when installed in a case. I've also had other 40mm fans—like these Arctics—that produce specific tones that pierce through just about anything you mount them to or in. In terms of quantitative noise levels, these are very quiet fans for what they are. I have some 40mm Sanyo Denkis on a 2.5" drive cage that max out at about 13,000rpm and are audible across the house at 8,000rpm; these Arctics are nothing like that. Qualitatively though, the noise these produce is specifically irritating to me. I can sit next to the server with those Sanyo Denkis screaming away and after a few minutes stop noticing them. A cynic might point out that this is because after a few minutes next to that server, I've gone deaf, but this is neither here nor there. By contrast, the single Arctic I had on the 5090, running at ~2,000rpm, was far more irritating in spite of being far quieter. It was *just* audible as a faint ticking buzz over the rest of the system. And unfortunately, at ~2,000rpm, it didn't move enough air to make a difference in my use case, so it was just added irritation with no benefit. It's not that they're loud—it's that the specific tone they make, even in the context of what they are, is particularly grating to me. But this is intrinsically subjective, so your experience may differ. ➤ Use Case Matters For their intended use case (in a 1U server), these are extremely quiet and highly power efficient. For use in a desktop, they become meaningfully audible far before they move a meaningful amount of air. As far as 40mm fans go, these are outstanding. But unless you have a specific need for a 40mm fan, you would generally be better served finding an alternative way to accomplish whatever task you're considering these for. ➤ Bottom Line I can't and won't knock any stars off the fan itself—these earn the full five stars easily. They're power-efficient, quiet for what they are, dual ball bearing, exceptionally well-built, and Arctic provides actual performance data including P/Q curves and PWM curves. Both are generally absent with consumer-grade fans and are hugely useful if you know how to read them, signaling that Arctic is serious about selling these for actual industrial/server use. For the home/enthusiast/desktop user, these are clearly audible below 2,000rpm, and probably outright unacceptable over 3,000rpm. If you have a specific need for them, I'd recommend them very highly. On balance these are likely the best 40mm fans on the market. At the same time, if you can accomplish your goal with a larger fan, you'd probably be happier going that route.

### ⭐⭐⭐⭐⭐ Excellent powerful and not too loud fan for my high speed network switch
*by S***H on July 2, 2026*

This one is the perfect balance between performance and noise compared to its bigger brother which is insanely loud Keeping my 10Gb network switch perfectly cool!

### ⭐⭐⭐⭐⭐ Works well, quiet, handy for weird GPUs
*by Z***A on May 14, 2026*

I'm using these to cool a CMP 100-210 GPU with a 3D printed attachment. Long story short - at 100%, these fans are still quite quiet - and they move a lot of air. Not nearly as loud as a typical 40mm server fan. I'll probably go with these when I need another 40mm fan. It's good stuff.

## Frequently Bought Together

- ARCTIC S4028-6K - 40x40x28 mm Server Fan, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black
- Noctua NF-A4x20 PWM, Premium Quiet Fan, 4-Pin (40x20mm, Brown)
- Noctua NF-A4x20 FLX Computer Case Fan - Cooling Components (Computer Case, Fan, 4 cm, 3700 RPM, 5000 RPM, 4400 RPM)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-07-14*