This article covers Cooler Master MasterBox NR400 Micro-ATX PCケースタワー ミニマルデザイン エアフローメッシュフロントパネル 240mm水冷対応 強化ガラス シングルヘッドセットジャック (MCB-NR400-KG5N-S00).

Overview

The Cooler Master MasterBox NR400 is a MicroATX mid-tower PC case that prioritizes airflow and clean aesthetics. Its full mesh front panel ensures efficient intake for high-performance components, while the tempered glass side panel keeps the build visible without obstruction. The case supports graphics cards up to 346mm in length, accommodating most modern GPUs with ease. It also offers support for up to 240mm radiators on the top, making it suitable for entry-level to mid-range water cooling setups. The NR400 strikes a solid balance between affordability and functionality, making it an excellent choice for budget-conscious builders.

Compatibility Guide

This case is designed for MicroATX and Mini-ITX motherboards only – ATX boards will not fit. The maximum GPU length is 346mm, and the case can house ATX power supplies in a bottom-mount configuration. It offers multiple drive bays for both 3.5-inch and 2.5-inch drives. Fan support includes 120mm units: up to 2 in the front, 2 at the top, and 1 at the rear. A 240mm radiator can be installed on the top panel. Ensure your CPU cooler height is within the manufacturer’s specified limit (approximately 166mm) before purchase.

Product Info

The Cooler Master MasterBox NR400 (model MCB-NR400-KG5N-S00) is a mid-range, mesh-front case with tempered glass window. It targets budget to mid-tier builds and is sold through major retailers worldwide. The front I/O includes two USB 3.0 ports and audio jacks; USB Type-C is not available. This model supports optical drives (ODD) optionally, with a separate variant available for those who need one.

Best Use Cases

  • Budget gaming PCs: The NR400 provides excellent thermal performance for mid-range components (e.g., Ryzen 5 + RTX 4060) without breaking the bank. - Compact office/workstation builds: Its MicroATX size fits neatly on a desk, while ample storage support allows for SSDs and HDDs. - First-time PC builders: Straightforward layout and spacious interior make cable management and component installation beginner-friendly.

Things to Consider

The case lacks a front-panel USB-C port, which may be a drawback for users with modern peripherals. Additionally, its cable management space behind the motherboard tray is somewhat limited, so thicker PSU cables may require careful routing. If you plan to install a very long graphics card (near the 346mm limit) together with a front fan, double-check clearance. Also, the ODD variant is not included in the standard KG5N model – if you need an optical drive, choose the ODD version (MCB-NR400-K5N-S00).

Product Disclosure (Amazon)

  • Manufacturer: Cooler Master
  • Seller: いいものをお客様に
  • Fulfilled by: いいものをお客様に
  • ASIN: B07PDT745F
  • Note: This article covers a manufacturer-made product based on Amazon listing details.