---
product_id: 121828239
title: "Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00)"
brand: "cooler master"
price: "46.29 OMR"
currency: OMR
in_stock: false
reviews_count: 13
url: https://www.desertcart.com.om/products/121828239-cooler-master-masterbox-nr400-micro-atx-pc-case-tower-minimal
store_origin: OM
region: Oman
---

# 346mm GPU support Full mesh ventilation Tempered glass side panel Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00)

**Brand:** cooler master
**Price:** 46.29 OMR
**Availability:** ❌ Out of Stock

## Summary

> ❄️ Cool design meets powerful performance — stay ahead, stay chill.

## Quick Answers

- **What is this?** Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) by cooler master
- **How much does it cost?** 46.29 OMR with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/121828239-cooler-master-masterbox-nr400-micro-atx-pc-case-tower-minimal)

## Best For

- cooler master enthusiasts

## Why This Product

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

## Key Features

- • **Clean & Organized:** 22mm cable clearance with rubber grommets for professional-grade cable management.
- • **Show Off Your Build:** Flush tempered glass side panel offers a sleek, unobstructed view.
- • **Breathe Easy with Mesh:** Full front and top mesh panels ensure superior airflow and cooling.
- • **Maximize Your GPU Power:** Supports graphics cards up to 346mm for cutting-edge performance.
- • **Streamlined Audio Setup:** Single 4-pole headset jack combines mic and audio for clutter-free connectivity.

## Overview

The Cooler Master MasterBox NR400 is a minimalist Micro-ATX tower designed for optimal thermal performance with full mesh front and top panels. It supports large graphics cards up to 346mm, features a flush tempered glass side panel for a clean aesthetic, and includes a single 4-pole headset jack for combined audio and mic use. With ample cable management space and optional ODD support, it balances sleek design with high functionality.

## Description

The Master Box NR400 applies optimal cooling and expandability to a minimalist, subtle design. With thermal capability at the forefront of features, the front panel and top panel are designed to signify airflow performance in its purest form. Functionality is blended to a compact design by maximizing use of internal space and implementing subtle design elements. The Master Box NR400 features a tempered glass side panel, fastened by thumbscrews on the rear panel, to keep the surface immaculately flush.

Review: The NR400 is an awesome MATX case with a perfect balance of price, features and style! - This is just really a stupendous MATX case that has every feature i've been searching forever for and have never found till now. For some reason, it's nearly impossible to find every feature I want in a MATX case... I can find them all in bigger cases, but not MATX... I've found MATX cases that have some, but not all the features... until now... here's what this case features that I have always sought but couldn't find until the NR400 was released: 1) Budget priced (under $100)... check 2) Good Cable Management... check 3) Unobstructed good airflow... check 4) A PSU shroud/basement... check 5) A tempered glass window, not acrylic... check 6) Mounting points for 2.5", 3.5" and a single 5.25" drive... check I can't think of (or I haven't found) a single MATX case that had all 6 of those things in one case till the NR400 came out. The last one was also important to me, as yes, I'm one of those people who still use an Optical Drive, as I have a large collection of family photos on DVD, old games on DVD I still like to load up from time to time, and I like to do some DVD burning of various projects... for those that don't need an optical drive, I totally understand, but there are tons of nice MATX cases to choose from that don't have an ODD bay, and so few with a bay that have other nice modern features. Anyways, i'm rambling... on with the review... The build quality is really nice for $59... I love everything about this case... if there are any complaints about quality, i'd give a slight mention to the back panel of the case being a tad flimsy, but this is more due to its extreme perforations for airflow and the lack of an I/O shield being there for support when you take it out of the box... once your build is complete, this stiffens up. The only other thing I don't like about the quality is the bottom PSU intake filter... it's kinda lame... just a cut plastic sheet that bends into place... i would have preferred something a little more "pull-out, push-in" like on other cases, but at $59, if this is the only grumble, it's forgivable and not enough to deduct a star. Airflow on this case is just awesome... there are far too many cases with terrible airflow... solid front panels or perforated panels that are far more metal than air (I'm looking at you MasterBox Q300L) that turn your PC into an oven. The NR400 has none of those problems... as with any case, I immediately tossed-out the stock fans and replaced them with three upHere 120mm fans... two up-front as intakes and one in the rear for exhaust... although there's nothing wrong with this setup, I wanted more and realized I could have more... so I upgraded my two front fans from a pair of 120mm fans to a pair of 140mm fans (also upHere). This really kicked up the airflow quite a bit (and is what you see in my pictures... the pair of 140mm fans up-front). This is a Haswell Core i7-4790 build using only air cooling (A CM Hyper 212 Black Edition), and at idle, i'm running 25-27 Celsius... under load in games, my CPU is usually in the mid 40s to low 50s tops. My GPU (a GTX 1660Ti) is anywhere from low 50s to about 62 tops, depending on the game and what's going on. This case just stays really cool with air cooling alone. Other features... cable management is easy with this case... it's easy to keep the viewable front of the case clean, as there's plenty of storage are in the back to hide your cables... there's four dedicated 2.5" bays, which have a unique "rubber gasket and insertable pin" arrangement to attach your SSDs to. Simply screw in four pins (included with the case) to the bottom of your SSD, and push into the gasket... it's held on with friction, stays in place, but easy to remove (see pics). Also, there's a removable and repositionable 3.5" bay under the PSU shroud... the bigger NR600, it's riveted in place, but on the NR400 you can move it or remove it, it's up to you. As previously mentioned, there is a single 5.25" bay which is rare in a case like this, and I'm happy to have it in a case this nice. If you don't want/need the bay, it is also removable to clean up your build. I really love this case... as it just came out in 2019, it was not available the last time I upgraded my case for this build. I did have my system in a Fractal Design Focus G Mini (another case I really liked, but not as perfect as this one)... however, I liked the features in this case so much, I went ahead and got it to switch my parts over to this case... it's that awesome, and i'm glad I did it. This is really a great case for the price. 5-Stars! Update 2022: yes, it fits an EVGA FTW3 3070Ti as well... pictures updated.
Review: Affordable, great airflow, nice build quality, minimalist looks - Great MicroATX case at a great price, I've had it a year and still very happy with it. This is an ideal case if you want great airflow in a compact case at a reasonable price. - Good quality, everything fits together well, tight tolerances, no weird gaps, didn't notice any sharp edges. - Attractive, minimalist design. Looks at home as a gamer PC or office PC. - Pretty compact for a MicroATX (many others I looked at were wider, taller, or both). - Great airflow, nice mesh design acts as a filter, easy to wipe off with a soft cloth. - Plenty of room for fans. I've outfitted mine with 2 140mm intake fans up front, 1 120mm exhaust in back, and a single 140mm and 120mm on a top-mounted AIO. - Intel 12600K CPU sees 64°C max temp with a slight OC to 5.1GHz, all power limits disabled, in Prime 95 Small FFTs for over 30-minutes. - Asus nVidia RTX 3070 Strix GPU, a 2.9-slot wide card, stays in the mid-60s range while gaming. - 5.25" bay, nice for those who can use it. I don't have an ODD, but I wanted a case with the bay to put a sensor panel. There are no holes on top of the PSU basement, but a nearly 3-slot GPU can breathe just fine in the case. A 4-slot GPU might have a more difficult time with airflow. The top has room for 2 140mm fans. The case officially supports a 240mm AIO up top. I put a 280mm AIO there (not officially supported), but had to use a 120mm fan on one side to clear the motherboard VRM. Using the 5.25" bay will prevent use of a top-mounted AIO or a 2nd case fan up top. I got around that limitation by 3D printing a custom shallow-mount bracket for my sensor panel display. Up to a 280mm AIO can also fit up front, but may prevent orienting the tubes in the preferred tubes-down orientation. 360mm AIO up front is not officially supported, but there's enough room and I've seen people pull it off with minor modding, but that would require giving up the 5.25" bay. It comes with a single 120mm exhaust fan. I didn't use this fan so I can't attest to how well it works. Only real drawback I can think of for this case, is it's so open, you can hear all the fans quite well. If you use noisy fans, you will hear them. Choose fans wisely, if you care about noise. Nothing specific to this case, it's the nature of open mesh-style cases.

## Features

- Mini Computer Tower
- Space for a bottom mounted power supply
- Four 3.5" bays and four 2.5" bays
- Ports: 2 x USB3.2 Gen 1 Type-A
- Suitable for Micro ATX and Mini-ITX motherboards

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07PDT745F |
| Antenna Location | Business, Gaming |
| Best Sellers Rank | #1,093 in Computer Cases |
| Brand | Cooler Master |
| Case Type | Mid Tower |
| Color | NR400 |
| Compatible Devices | CPU |
| Cooling Method | Air |
| Customer Reviews | 4.6 out of 5 stars 1,190 Reviews |
| Enclosure Material | Alloy Steel, Plastic, Tempered Glass |
| Fan Size | 120 Millimeters |
| Global Trade Identification Number | 00884102052750 |
| Hard Disk Form Factor | 3.5 Inches |
| Internal Bays Quantity | 8 |
| Item Dimensions D x W x H | 16.18"D x 8.27"W x 16.18"H |
| Item Weight | 6.6 Kilograms |
| Manufacturer | Cooler Master |
| Material | Alloy Steel, Plastic, Tempered Glass |
| Mfr Part Number | MCB-NR400-KG5N-S00 |
| Model Name | NR400 |
| Model Number | MCB-NR400-KG5N-S00 |
| Motherboard Compatability | Micro ATX |
| Other Special Features of the Product | Dust Filter, Single Headset Jack both Audio|Microphone, Tempered Glass |
| Power Supply Mounting Type | Bottom Mount |
| Recommended Uses For Product | Business, Gaming |
| Supported Motherboard | Micro ATX |
| Total Expansion Slots Quantity | 4 |
| Total USB 2.0 Ports | 2 |
| Total USB 3.0 Ports | 2 |
| Total Usb Ports | 4 |
| UPC | 884102052750 |
| Unit Count | 1.0 Count |
| Warranty Description | 2 Year Warranty |

## Product Details

- **Brand:** Cooler Master
- **Motherboard Compatability:** Micro ATX
- **Case Type:** Mid Tower
- **Recommended Uses For Product:** Business, Gaming
- **Color:** NR400
- **Material:** Alloy Steel, Plastic, Tempered Glass
- **Power Supply Mounting Type:** Bottom Mount
- **Cooling Method:** Air
- **Model Name:** NR400
- **Fan Size:** 120 Millimeters

## Images

![Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) - Image 1](https://m.media-amazon.com/images/I/91wCVd8eoQL.jpg)
![Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) - Image 2](https://m.media-amazon.com/images/I/81QMSK9-DQL.jpg)
![Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) - Image 3](https://m.media-amazon.com/images/I/81P6yLUDKrL.jpg)
![Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) - Image 4](https://m.media-amazon.com/images/I/81uwkLfqYBL.jpg)
![Cooler Master MasterBox NR400 Micro-ATX PC Case Tower, Minimal Design, Airflow Mesh Front Panel, 240mm Water-Cooling Support, Tempered Glass, Single Headset Jack (MCB-NR400-KG5N-S00) - Image 5](https://m.media-amazon.com/images/I/814QjXwknzL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ The NR400 is an awesome MATX case with a perfect balance of price, features and style!
*by W***E on May 15, 2019*

This is just really a stupendous MATX case that has every feature i've been searching forever for and have never found till now. For some reason, it's nearly impossible to find every feature I want in a MATX case... I can find them all in bigger cases, but not MATX... I've found MATX cases that have some, but not all the features... until now... here's what this case features that I have always sought but couldn't find until the NR400 was released: 1) Budget priced (under $100)... check 2) Good Cable Management... check 3) Unobstructed good airflow... check 4) A PSU shroud/basement... check 5) A tempered glass window, not acrylic... check 6) Mounting points for 2.5", 3.5" and a single 5.25" drive... check I can't think of (or I haven't found) a single MATX case that had all 6 of those things in one case till the NR400 came out. The last one was also important to me, as yes, I'm one of those people who still use an Optical Drive, as I have a large collection of family photos on DVD, old games on DVD I still like to load up from time to time, and I like to do some DVD burning of various projects... for those that don't need an optical drive, I totally understand, but there are tons of nice MATX cases to choose from that don't have an ODD bay, and so few with a bay that have other nice modern features. Anyways, i'm rambling... on with the review... The build quality is really nice for $59... I love everything about this case... if there are any complaints about quality, i'd give a slight mention to the back panel of the case being a tad flimsy, but this is more due to its extreme perforations for airflow and the lack of an I/O shield being there for support when you take it out of the box... once your build is complete, this stiffens up. The only other thing I don't like about the quality is the bottom PSU intake filter... it's kinda lame... just a cut plastic sheet that bends into place... i would have preferred something a little more "pull-out, push-in" like on other cases, but at $59, if this is the only grumble, it's forgivable and not enough to deduct a star. Airflow on this case is just awesome... there are far too many cases with terrible airflow... solid front panels or perforated panels that are far more metal than air (I'm looking at you MasterBox Q300L) that turn your PC into an oven. The NR400 has none of those problems... as with any case, I immediately tossed-out the stock fans and replaced them with three upHere 120mm fans... two up-front as intakes and one in the rear for exhaust... although there's nothing wrong with this setup, I wanted more and realized I could have more... so I upgraded my two front fans from a pair of 120mm fans to a pair of 140mm fans (also upHere). This really kicked up the airflow quite a bit (and is what you see in my pictures... the pair of 140mm fans up-front). This is a Haswell Core i7-4790 build using only air cooling (A CM Hyper 212 Black Edition), and at idle, i'm running 25-27 Celsius... under load in games, my CPU is usually in the mid 40s to low 50s tops. My GPU (a GTX 1660Ti) is anywhere from low 50s to about 62 tops, depending on the game and what's going on. This case just stays really cool with air cooling alone. Other features... cable management is easy with this case... it's easy to keep the viewable front of the case clean, as there's plenty of storage are in the back to hide your cables... there's four dedicated 2.5" bays, which have a unique "rubber gasket and insertable pin" arrangement to attach your SSDs to. Simply screw in four pins (included with the case) to the bottom of your SSD, and push into the gasket... it's held on with friction, stays in place, but easy to remove (see pics). Also, there's a removable and repositionable 3.5" bay under the PSU shroud... the bigger NR600, it's riveted in place, but on the NR400 you can move it or remove it, it's up to you. As previously mentioned, there is a single 5.25" bay which is rare in a case like this, and I'm happy to have it in a case this nice. If you don't want/need the bay, it is also removable to clean up your build. I really love this case... as it just came out in 2019, it was not available the last time I upgraded my case for this build. I did have my system in a Fractal Design Focus G Mini (another case I really liked, but not as perfect as this one)... however, I liked the features in this case so much, I went ahead and got it to switch my parts over to this case... it's that awesome, and i'm glad I did it. This is really a great case for the price. 5-Stars! Update 2022: yes, it fits an EVGA FTW3 3070Ti as well... pictures updated.

### ⭐⭐⭐⭐⭐ Affordable, great airflow, nice build quality, minimalist looks
*by G***T on June 28, 2023*

Great MicroATX case at a great price, I've had it a year and still very happy with it. This is an ideal case if you want great airflow in a compact case at a reasonable price. - Good quality, everything fits together well, tight tolerances, no weird gaps, didn't notice any sharp edges. - Attractive, minimalist design. Looks at home as a gamer PC or office PC. - Pretty compact for a MicroATX (many others I looked at were wider, taller, or both). - Great airflow, nice mesh design acts as a filter, easy to wipe off with a soft cloth. - Plenty of room for fans. I've outfitted mine with 2 140mm intake fans up front, 1 120mm exhaust in back, and a single 140mm and 120mm on a top-mounted AIO. - Intel 12600K CPU sees 64°C max temp with a slight OC to 5.1GHz, all power limits disabled, in Prime 95 Small FFTs for over 30-minutes. - Asus nVidia RTX 3070 Strix GPU, a 2.9-slot wide card, stays in the mid-60s range while gaming. - 5.25" bay, nice for those who can use it. I don't have an ODD, but I wanted a case with the bay to put a sensor panel. There are no holes on top of the PSU basement, but a nearly 3-slot GPU can breathe just fine in the case. A 4-slot GPU might have a more difficult time with airflow. The top has room for 2 140mm fans. The case officially supports a 240mm AIO up top. I put a 280mm AIO there (not officially supported), but had to use a 120mm fan on one side to clear the motherboard VRM. Using the 5.25" bay will prevent use of a top-mounted AIO or a 2nd case fan up top. I got around that limitation by 3D printing a custom shallow-mount bracket for my sensor panel display. Up to a 280mm AIO can also fit up front, but may prevent orienting the tubes in the preferred tubes-down orientation. 360mm AIO up front is not officially supported, but there's enough room and I've seen people pull it off with minor modding, but that would require giving up the 5.25" bay. It comes with a single 120mm exhaust fan. I didn't use this fan so I can't attest to how well it works. Only real drawback I can think of for this case, is it's so open, you can hear all the fans quite well. If you use noisy fans, you will hear them. Choose fans wisely, if you care about noise. Nothing specific to this case, it's the nature of open mesh-style cases.

### ⭐⭐⭐⭐ Nice, simplistic micro-ATX case
*by S***N on June 10, 2020*

The case looks nice and has great air flow, and it's fairly easy to maneuver cables in despite its size. However, the standoffs in my case were ridiculously hard to take out of their slots. I had to use a pair of pliers to get them out, and I ended up scratching the case a little bit. Once they're out though, they're pretty easy to get into other slots. Though, I may have used a bit too much force getting them out, and the ones I moved didn't play too nice when I had to unscrew my motherboard. Also, the locking mechanism for the CD drive isn't great, and it felt out a few times while trying to put the drive in. Aside from these though, it does what it needs to and looks great doing it.

## Frequently Bought Together

- Cooler Master MasterBox NR400 Micro-ATX Tower with Front Mesh Ventilation, Minimal Design, Tempered Glass Side Panel and Single Headset Jack
- CORSAIR VENGEANCE LPX DDR4 RAM 16GB (2x8GB) 3200MHz CL16-18-18-36 1.35V Intel AMD Desktop Computer Memory - Black (CMK16GX4M2B3200C16)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-06-13*