This article covers JONSBO D400 ブラック ATX ミッドタワー PCケース.

Overview

The JONSBO D400 is an ATX mid-tower PC case featuring a distinctive three-dimensionally chamfered curved glass panel. Measuring 488×239×514mm, it supports ATX, Micro-ATX, and Mini-ITX motherboards, including back-connect (BTF) designs that simplify cable management. With a GPU clearance of up to 450mm, even the largest flagship graphics cards fit with room to spare. Cooling is equally impressive: the case accommodates dual 360mm radiators (top and side), making it suitable for high-end liquid cooling setups. Priced around ¥69,112 (approximately $480 USD at current exchange rates), the D400 occupies a mid-to-high tier in the case market. Its curved glass panel is a rare aesthetic feature in this price bracket, while ten fan mounting positions allow flexible airflow configurations. A front-panel USB 3.2 Gen 2 Type-C port ensures compatibility with modern peripherals. Overall, this case is a versatile choice for gamers, enthusiasts, and workstation builders alike.

Compatibility Guide

Motherboard support covers ATX, Micro-ATX, and Mini-ITX form factors. The case also supports BTF (back-connect) motherboards, which route cables to the rear for a cleaner internal look. GPU length is capped at 450mm, so virtually any consumer graphics card will fit. CPU cooler height is limited to 169mm — most dual-tower air coolers are compatible, but large 200mm-class coolers will not fit. Power supply must be ATX PS2 type. For storage, you get either 2.5-inch SSD ×2, or one 3.5-inch HDD plus one 2.5-inch SSD. If you need more drives, consider using M.2 slots on the motherboard or adding a separate storage enclosure.

Product Info

Released in 2025, the JONSBO D400 sells for around ¥69,112 on Japan. The chassis is constructed primarily from metal with a black finish, and cooling relies on fan airflow — though it is designed to accept both top and side 360mm radiators. Warranty details are not specified, but JONSBO typically offers a 1-2 year warranty on cases. Market positioning places it in the mid-to-high tier, balancing striking design (curved glass) with dual 360mm radiator support for advanced cooling.

Best Use Cases

Gaming builds: The 450mm GPU clearance and dual 360mm radiator support make this case ideal for high-end gaming rigs with flagship GPUs and custom liquid cooling loops. The curved glass side panel provides a clear view of RGB-lit components. Creator workstations: With support for a 3.5-inch HDD and one 2.5-inch SSD, you can combine bulk storage with a fast boot drive. BTF motherboard compatibility keeps interior wiring tidy, which is important for maintenance-heavy systems. Aesthetics-focused builds: The unique curved glass design sets this case apart from typical flat-panel cases. If you want your PC to be a centerpiece on your desk, the D400’s appearance delivers without sacrificing thermal performance. ## Alternatives
Direct competitors in a similar price bracket include the Fractal Design Pop Air and NZXT H5 Flow. The Pop Air offers a more traditional look and slightly better out-of-the-box airflow at a lower price (~$90-100), but lacks the curved glass and dual 360mm radiator support. The NZXT H5 Flow focuses on GPU cooling via a dedicated bottom fan and costs around $100-120, but its CPU cooler clearance is 165mm — slightly less than the D400. If you prioritize unique aesthetics and maximum radiator support, the JONSBO D400 is the stronger choice. For conventional value, the alternatives are cheaper and still capable.

Things to Consider

First, CPU cooler height is limited to 169mm. If you plan to use a massive air cooler (e.g., Noctua NH-D15 at 165mm works, but some 170mm+ coolers may not), verify clearance or plan for a liquid cooler. Second, storage expansion is limited. You cannot install multiple 3.5-inch HDDs simultaneously. Users requiring many drives should look at cases with more drive bays or consider external storage. Third, the price is relatively high for a mid-tower case. JONSBO’s own D41 model offers similar features at a lower cost, though without the curved glass. If the glass design is not essential, you can save money. Finally, the curved glass panel is more fragile than flat tempered glass. Handle with care during transport and assembly to avoid cracks.

Product Disclosure (Amazon)

  • Manufacturer: JONSBO
  • Seller: SELLOYSA LLC
  • Fulfilled by: SELLOYSA LLC
  • ASIN: B0FP2QXKBP
  • Note: This article covers a manufacturer-made product based on Amazon listing details.