This article covers Fractal Design Define R5 Black Pearl PCケース.

Overview

The Fractal Design Define R5 Black Pearl is a mid-tower PC case that has set the standard for silent computing. Manufactured by the Swedish company Fractal Design, this case combines high-density sound-dampening material with a versatile internal layout. Standard features include two pre-installed 140mm Dynamic series fans and ModuVent™ covers that let you seal off unused fan openings to further reduce noise. Inside, the Define R5 supports ATX, Micro ATX, and Mini-ITX motherboards, offering ample room for high-end graphics cards up to 310mm (440mm without front fan). With eight internal drive bays and two 5.25-inch external bays, it caters equally to storage-heavy builds and silent workstations. The understated Black Pearl finish makes it suitable for both home and office environments.

Compatibility Guide

The Define R5 is compatible with standard ATX, Micro ATX, and Mini-ITX form factors. The power supply is mounted at the bottom, accommodating units up to 200mm in depth. Maximum GPU length is 310mm with the front fan installed, and up to 440mm without it, easily fitting today's flagship cards. CPU cooler clearance is a generous 180mm, allowing for most large air coolers and all-in-one liquid coolers up to 280mm radiators in the front or top. Storage flexibility is outstanding: the case includes two 5.25-inch external bays and eight combined 3.5/2.5-inch internal drive trays. However, the front panel only provides USB 3.0 Type-A and USB 2.0 ports; there is no USB-C port. This may require an adapter or PCIe card for modern USB-C peripherals.

Product Info

The Define R5 Black Pearl was originally released in 2014 and remains widely available through major retailers like Japan. Its price typically ranges from ¥15,000 to ¥20,000, offering excellent value for a premium silent case. The manufacturer provides a 2-year warranty in Japan. Positioned as a mid-range case, it delivers high-end noise insulation and expansion capabilities that rival more expensive models. Weight is approximately 11.2 kg (24.7 lb), reflecting the dense sound-dampening material and robust steel construction. Cooling options are extensive: two front 140mm fans included, plus mounts for additional fans in the bottom, top, and rear. Support for water cooling includes front radiators up to 280mm and top radiators up to 240mm.

Best Use Cases

The Define R5 is ideal for users who prioritize near-silent operation. Thanks to its sound-dampening foam and ModuVent panels, it is an excellent choice for recording studios, home theaters, or any environment where fan noise must be minimized. It also excels as a storage server or large-capacity workstation case. With up to eight internal drive bays and two 5.25-inch bays, you can install numerous HDDs and SSDs for file storage, NAS applications, or video editing projects without running out of space. Finally, the Define R5 suits users who prefer a minimalist, professional aesthetic. Its clean lines and black pearl finish blend seamlessly into office or living-room setups, making it a versatile choice for work and gaming alike.

Things to Consider

The lack of a front USB-C port is a notable limitation in today's connectivity landscape. Users with USB-C motherboards or peripherals will need an adapter or expansion card. Additionally, the top panel is not ventilated for large radiators unless you remove the ModuVent cover and sound-dampening layer, which compromises noise isolation slightly. This case has no windowed side panel (the model is the solid-side version). If you want to show off RGB components, consider the Define R5 Window variant or a different case. The weight (11.2 kg) makes it less convenient for frequent transport, and the internal layout, while spacious, may require careful planning for complex water-cooling loops. Overall, the Define R5 remains a top-tier silent case for those who value acoustics and storage capacity over flashy aesthetics or the latest front-panel standards.

Product Disclosure (Amazon)

  • Manufacturer: Fractal(フラクタル)
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B00Q2Z11QE
  • Note: This article covers a manufacturer-made product based on Amazon listing details.