---
product_id: 431579980
title: "S4028-6K - 40x40x28 mm Fan, 250-6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black"
brand: "arctic"
price: "R794"
currency: ZAR
in_stock: true
reviews_count: 5
category: "Arctic"
url: https://www.desertcart.co.za/products/431579980-s4028-6k-40x40x28-mm-fan-250-6000-rpm-pwm-regulated
store_origin: ZA
region: South Africa
---

# PWM regulated speed 6000 RPM max speed 12.06 m³/h airflow S4028-6K - 40x40x28 mm Fan, 250-6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

**Brand:** arctic
**Price:** R794
**Availability:** ✅ In Stock

## Summary

> 🌪️ Power your setup with precision airflow — don’t let your gear overheat!

## Quick Answers

- **What is this?** S4028-6K - 40x40x28 mm Fan, 250-6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black by arctic
- **How much does it cost?** R794 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/431579980-s4028-6k-40x40x28-mm-fan-250-6000-rpm-pwm-regulated)

## 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

- • **Built to Endure:** Dual ball bearing design ensures long-lasting durability and resilience against heat and dust
- • **Effortless Control:** 4-pin PWM connector with backward compatibility for 2/3-pin headers and flexible 40 cm cable
- • **Balanced Performance:** Optimal static pressure of 4.2 mm/H2O delivers efficient cooling without noise compromise
- • **Versatile Compatibility:** Fits 1U server cases and a variety of devices from NAS to 3D printers
- • **Precision Cooling Mastery:** Wide 250-6000 RPM range for tailored airflow and whisper-quiet operation

## Overview

The S4028-6K is a compact 40x40x28 mm fan featuring a robust dual ball bearing system, PWM speed regulation from 250 to 6000 RPM, and a 4-pin connector for precise control. Delivering up to 12.06 m³/h airflow and 4.2 mm/H2O static pressure, it’s engineered for versatile use in server cases, NAS, mini PCs, and more, combining durability with quiet, efficient cooling.

## Description

ARCTIC offers innovative solutions incessantly - changing impossible user requirements into new. Always focused on our customers, ARCTIC is devoted to deliver excellence through a strong dedication and a high sense of commitment. In light of the ever-changing consumer landscapes, we aspire to continue to expand and diversify our products and solutions. From computer cooling and peripherals to audio and digital home entertainment, we strive to enrich people's lives by creating innovative, user friendly yet affordable products with a great value of benefit. For us value for money is a key factor - a constant our customers rely on.

Review: 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: No frills, no marketing bs, just pure performance. I needed good 40mm PWMs to cool my optane rams and these were perfect. I would have gotten the normal AVC used in servers but they're too loud. The 11k RPM version of this would work just as well and is also quiet compared to the AVC but it was not needed for this use case. The rams were hitting 70c prior without proper airflow. They peak at 43c with these fans mounted on top.

## 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 | #122 in Computer Case Fans |
| Brand | ARCTIC |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.5 4.5 out of 5 stars (133) |
| Date First Available | February 9, 2022 |
| Item Weight | 0.634 ounces |
| Item model number | ACFAN00185A |
| Manufacturer | ARCTIC |
| Material | Plastic |
| Maximum Rotational Speed | 6000 RPM |
| Number of Items | 1 |
| Power Connector Type | 2510 4-Pin Fan-Connector |
| Product Dimensions | 1.1"L x 1.57"W x 1.57"H |
| UPC | 840033401609 |
| Voltage | 12 Volts |
| Wattage | 1.2 watts |

## Product Details

- **Brand:** ARCTIC
- **Cooling method:** Air
- **Power connector type:** 4-Pin
- **Voltage:** 12 Volts
- **Wattage:** 1.2 watts

## Images

![S4028-6K - 40x40x28 mm Fan, 250-6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black - Image 1](https://m.media-amazon.com/images/I/51tHzOmapnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***S on 13 October 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.

### ⭐⭐⭐⭐⭐ Review
*by F***4 on 1 May 2025*

No frills, no marketing bs, just pure performance. I needed good 40mm PWMs to cool my optane rams and these were perfect. I would have gotten the normal AVC used in servers but they're too loud. The 11k RPM version of this would work just as well and is also quiet compared to the AVC but it was not needed for this use case. The rams were hitting 70c prior without proper airflow. They peak at 43c with these fans mounted on top.

### ⭐⭐⭐⭐⭐ Review
*by E***S on 13 January 2026*

Excellent fans!!

## 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 South Africa*
*Store origin: ZA*
*Last updated: 2026-03-02*