---
product_id: 478823732
title: "– be quiet! Silent Wings Pro 4 140mm PWM fan, optimized fan blades, extraordinary high performance, Speed Switch for changing maximum PWM speed, 6-pole fan motor, fluid-dynamic bearing"
brand: "be quiet!"
price: "฿4683"
currency: THB
in_stock: true
reviews_count: 13
category: "Be Quiet!"
url: https://www.desertcart.co.th/products/478823732-be-quiet-silent-wings-pro-4-140mm-pwm-fan-optimized
store_origin: TH
region: Thailand
---

# 140mm optimized fan blades 6-pole motor with fluid-dynamic bearing Speed switch for 3 max RPM modes – be quiet! Silent Wings Pro 4 140mm PWM fan, optimized fan blades, extraordinary high performance, Speed Switch for changing maximum PWM speed, 6-pole fan motor, fluid-dynamic bearing

**Brand:** be quiet!
**Price:** ฿4683
**Availability:** ✅ In Stock

## Summary

> 🖤 Silent power that your high-end rig deserves

## Quick Answers

- **What is this?** – be quiet! Silent Wings Pro 4 140mm PWM fan, optimized fan blades, extraordinary high performance, Speed Switch for changing maximum PWM speed, 6-pole fan motor, fluid-dynamic bearing by be quiet!
- **How much does it cost?** ฿4683 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/478823732-be-quiet-silent-wings-pro-4-140mm-pwm-fan-optimized)

## Best For

- be quiet! enthusiasts

## Why This Product

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

## Key Features

- • **Adaptive speed control:** Switch effortlessly between medium, high, and ultra-high RPM for tailored cooling
- • **Whisper-quiet operation:** 6-pole motor and fluid-dynamic bearing reduce noise to a near-silent 36.8dB(A)
- • **Versatile mounting options:** Includes radiator corners, anti-vibration mounts, and plastic mounts for any build
- • **Power-efficient performance:** Low power consumption ensures cool hardware without energy waste
- • **Precision-engineered fan blades:** Optimized for extraordinary air pressure and silent airflow

## Overview

The be quiet! Silent Wings Pro 4 140mm PWM fan features newly designed blades for unmatched air pressure and cooling efficiency. Its 6-pole motor with fluid-dynamic bearing ensures ultra-quiet operation at just 36.8dB(A) max noise. The integrated speed switch lets you toggle between three maximum RPM settings, adapting to any cooling demand from everyday tasks to intense gaming or workstation loads. With multiple mounting options and low power consumption, it’s the premium choice for professionals seeking silent, powerful airflow in cases, radiators, or heatsinks.

## Description

Optimized fan blades deliver exceptional air pressure and cooling. Speed switch for adjustable max PWM speed. Ideal for cases, radiators, and heatsinks.

Review: Excellent fan. - Below about 25% it is essentially silent, and still moves quite a lot of air. Even at 50% its still quiet. Yes, its noisy at 100%.... but all fans are, this one is not as noisy as any other fan I've ever used at any speed.
Review: Noise reducing fan that actually works. - I’m really impressed with these. Installed into a computer that is used in the lounge, keeps the noise to a minimum while still being powerful. Cools the computer adequately. Really easy to install with the help of YouTube. Definitely worth the money.

## Features

- The fan blades are what makes a fan. It is for this reason that the fan blades of Silent Wings Pro 4 140mm PWM have been developed newly from scratch. The new blade arrangement enables a performance second to none for all possible operations. Be it in a case, on radiators or heat sinks.
- Silent Wings Pro 4 140mm PWM makes for extraordinary air pressure and therefore, significantly increases the system’s performance. The decreased distance between the fan blades and the frame enables an extraordinarily high air pressure. By that, the Silent Wings Pro 4 140mm PWM allows the user to run even the most demanding applications.
- The speed switch makes switching between medium, high-speed and ultra-high-speed of maximum RPM levels quick and easy. The Silent Wings Pro 4 140mm PWM alters its application with a simple slide to the right. Medium-speed is suitable for any operation that requires regular cooling performance. High-speed lets the fan spin faster, providing more cooling power. Ultra-high-speed ultimately offers enough rpm to cool even the most demanding hardware in high-end PC builds.
- 6-pole fan motor with 3 phases for very low power consumption, less vibration and therefore quiet max. operation of 36.8dB(A). Equipped with this state-of-the-art technology the fan is virtually inaudible when operated in mid-speed.
- Silent Wings Pro 4 140mm PWM has 3 mounting options in the scope of delivery. The pre-installed radiator corners are specially designed for radiators on which the incomparable performance of this high-end fan completely shines. On the other hand, for chassis use, the anti-vibration mounting is the first choice as they reduce vibrations to a minimum. The plastic mountings round up the scope.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B74CP6X2 |
| Are Batteries Included | No |
| Best Sellers Rank | 5,848 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 265 in Components & Replacement Parts |
| Brand | be quiet! |
| Colour | Black |
| Computer Memory Type | DIMM |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,696) |
| Date First Available | 20 July 2022 |
| Guaranteed software updates until | unknown |
| Item Weight | 310 g |
| Item model number | BL099 |
| Manufacturer | be quiet! |
| Product Dimensions | 14 x 2.5 x 14 cm; 310 g |
| Series | SILENT WINGS PRO 4 140mm PWM |
| Voltage | 12 Volts |
| Wattage | 3.04 watts |

## Product Details

- **Brand:** be quiet!
- **Compatible devices:** Radiator
- **Cooling method:** Air
- **Material:** Polycarbonate
- **Maximum rotational speed:** 2400 RPM
- **Noise level:** 36.8 Decibels
- **Power connector type:** 4-Pin
- **Product dimensions:** 14L x 14W x 2.5H centimetres
- **Voltage:** 12 Volts
- **Wattage:** 3.04 watts

## Images

![– be quiet! Silent Wings Pro 4 140mm PWM fan, optimized fan blades, extraordinary high performance, Speed Switch for changing maximum PWM speed, 6-pole fan motor, fluid-dynamic bearing - Image 1](https://m.media-amazon.com/images/I/71oTv6qUmKL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent fan.
*by N***Z on 2 November 2025*

Below about 25% it is essentially silent, and still moves quite a lot of air. Even at 50% its still quiet. Yes, its noisy at 100%.... but all fans are, this one is not as noisy as any other fan I've ever used at any speed.

### ⭐⭐⭐⭐⭐ Noise reducing fan that actually works.
*by L***N on 16 August 2025*

I’m really impressed with these. Installed into a computer that is used in the lounge, keeps the noise to a minimum while still being powerful. Cools the computer adequately. Really easy to install with the help of YouTube. Definitely worth the money.

### ⭐⭐⭐⭐⭐ Top performer
*by M***E on 20 September 2025*

I recently bought the Corsair RS120 (set of three), and they did not meet expectation (I could hear them over my noise cancelling headphones), I could tune with the fan curve, but even then they still fell below expectation. They're now boxed up in the cupboard as a backup. I already had a beQuiet CPU sink/fan and it's basically silent (actually silent, not just a marketing gimmick) so I thought I'd try the beQuiet Silent Wings 4 for my front fans. Needless to say they're pricey, but.... very very quiet - so I'm very happy. At highest RPM's you can hear them whirring, but for standard PC use and even gaming, they're silent or near silent. Even when you can hear it, the sounds is restrained, no hair-dryer here... If you value peace and quiet, these are the ones to go for.

## Frequently Bought Together

- be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099
- be quiet! Silent Wings 4 Cooling Fan | 120mm PWM high-Speed | White | BL115

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-28*