---
product_id: 457776895
title: "S4028-6K (5 Pack)"
brand: "arctic"
price: "$26.35"
currency: USD
in_stock: true
reviews_count: 10
category: "Arctic"
url: https://www.desertcart.us/products/457776895-s4028-6k-5-pack
store_origin: US
region: United States of America
---

# 12.06 m³/h airflow 6000 RPM max speed Dual ball bearing durability S4028-6K (5 Pack)

**Brand:** arctic
**Price:** $26.35
**Availability:** ✅ In Stock

## Summary

> 🖤 Arctic power in a compact frame — cool smarter, not louder.

## Quick Answers

- **What is this?** S4028-6K (5 Pack) by arctic
- **How much does it cost?** $26.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/457776895-s4028-6k-5-pack)

## 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

- • **Compact Yet Mighty:** 40x40x28 mm size fits tight 1U server spaces without compromising airflow or pressure.
- • **Precision PWM Control:** Seamlessly adjust fan speed from whisper-quiet to powerful cooling with PWM regulation.
- • **Versatile Compatibility:** Standard 4-pin connector plus 2/3-pin support and 40 cm cable for flexible installation.
- • **Balanced Cooling & Noise:** Max 6000 RPM delivers optimal airflow with minimal noise—perfect for professional setups.
- • **Engineered for Endurance:** Dual ball bearings ensure long-lasting performance even under heat and dust stress.

## Overview

The ARCTIC S4028-6K is a high-performance 40mm server fan designed for 1U rack cooling with a wide 250–6000 RPM speed range controlled via PWM. Featuring dual ball bearings for enhanced durability and a maximum airflow of 12.06 m³/h at 4.2 mm/H2O static pressure, it balances efficient cooling with low noise output. Its 4-pin connector and 40 cm cable provide versatile installation options, making it ideal for servers, NAS, mini PCs, and other compact electronics requiring reliable thermal management.

## 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: Works well, quiet, handy for weird GPUs - 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.

## 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 | #101 in Computer Case Fans |
| Brand | ARCTIC |
| Brand Name | ARCTIC |
| Compatible Devices | Desktop |
| Cooling Method | Air |
| Customer Reviews | 4.4 out of 5 stars 152 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

- **Brand:** ARCTIC
- **Compatible Devices:** Printer, Server
- **Cooling Method:** Air
- **Material:** Polycarbonate
- **Maximum Rotational Speed:** 6000 RPM
- **Noise Level:** 38 Decibels
- **Power Connector Type:** 2510 4-Pin Fan-Connector
- **Product Dimensions:** 1.57"L x 1.1"W x 1.57"H
- **Voltage:** 12 Volts
- **Wattage:** 1.2 watts

## Images

![S4028-6K (5 Pack) - Image 1](https://m.media-amazon.com/images/I/51tHzOmapnL.jpg)
![S4028-6K (5 Pack) - Image 2](https://m.media-amazon.com/images/I/51EwZpt3xzL.jpg)
![S4028-6K (5 Pack) - Image 3](https://m.media-amazon.com/images/I/71x8fI4+ddL.jpg)
![S4028-6K (5 Pack) - Image 4](https://m.media-amazon.com/images/I/61kMQkdOqsL.jpg)
![S4028-6K (5 Pack) - Image 5](https://m.media-amazon.com/images/I/71tsYPrQcwL.jpg)

## Available Options

This product comes in different **Size** options.

## 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.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Solid. Looks like decent quality. Time will tell
*by J***S on April 19, 2026*

Works great, not too loud

## Frequently Bought Together

- ARCTIC S4028-6K (5 Pack) - 40x40x28 mm Server Fans, 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-A4x10 FLX, Premium Quiet Fan, 3-Pin (40x10mm, Brown)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/457776895-s4028-6k-5-pack](https://www.desertcart.us/products/457776895-s4028-6k-5-pack)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-05*