# JONSBO D400 Review: Curved-Glass ATX Case, Dual 360mm Rads & Fit Checks > JONSBO D400 fit guide: 450mm GPU, 169mm cooler, top/side 360mm rads, BTF boards, plus airflow and storage caveats before buying. Tags: pc-case, atx, mid-tower, jonsbo, curved-glass, btf, 360mm-radiator Source: https://www.amazon.co.jp/dp/B0FP2QXKBP Article page: https://web-autoai.com/articles/jonsbo-d400-atx-pc?lang=en Prices and ratings change over time — check the article page for the current values. --- This guide covers the JONSBO D400 — ATX Mid Tower Case with Curved Tempered Glass. It is a showcase-style mid-tower that can take a 360mm radiator on both the top and the side. Using the spec sheet, we answer three questions: will your parts fit, how should you cool it, and what do you give up? ## Overview The JONSBO D400 is an ATX mid-tower with a three-dimensionally chamfered curved glass panel. It measures 239mm wide, 488mm deep and 514mm tall. It supports ATX, Micro-ATX and Mini-ITX boards, plus BTF (back-connect) motherboards. GPUs up to 450mm long and CPU coolers up to 169mm tall will fit. In short, this case suits builders who want to pair a long flagship GPU with a 360mm AIO in a build meant to be seen. It is a poor fit for anyone who needs several 3.5-inch HDDs or a very tall air cooler. Cooling flexibility is high, but storage is deliberately minimal. There are ten fan positions in total. However, the spec sheet lists only the top, side, rear and PSU compartment, with no front positions. Airflow therefore works differently from the usual front-to-back layout, and that is the first thing to understand before you buy. ## Design Notes From the Spec Sheet ### No front intake The listed fan positions are top 120mm x3 or 140mm x2, side 120mm x3, rear 120mm x1, and the PSU compartment. The front is covered by curved glass and has no listed fan mounts. Fresh air will therefore come mainly from the side and the PSU compartment area, while the top and rear are the natural exhaust paths. This layout puts looks first. If you build it the way you would a mesh-front case, you may end up short on intake. Plan how many fans go where before you buy. ### 360mm on the top and the side The top takes 240, 280 or 360mm radiators, and the side takes a 360mm radiator. Using only the top gives you a standard 360mm AIO build. Using both opens the door to separate CPU and GPU loops. Many mid-towers in this price range offer only one 360mm location, so this is the D400's main cooling advantage. ### Front I/O The front panel has one USB 3.2 Gen 2 Type-C port, two USB 3.0 ports, and a 2-in-1 combo audio jack. The Type-C port needs a matching front-panel Type-C header on the motherboard (see Things to Check Before Buying). ## Compatibility Guide | Item | Spec | What to check | |---|---|---| | Motherboard | ATX / Micro-ATX / Mini-ITX / BTF | E-ATX is not listed | | GPU length | Up to 450mm | Card thickness and room to bend power cables | | CPU cooler height | Up to 169mm | Anything taller will not fit | | PSU | ATX (PS2) | Max PSU length is not listed | | Top radiator | 240 / 280 / 360mm | Combined radiator and fan thickness | | Side radiator | 360mm | Clearance against the GPU and cooler | | Drive bays | 3.5-inch x1 / 2.5-inch x2 | Whether bays are shared | | Dimensions | 239 x 488 x 514mm | Desk depth and floor space | These are spec values. In real builds, the problems usually come from parts that fit on their own but clash when combined. ### Motherboard Standard ATX, Micro-ATX and Mini-ITX boards mount normally. BTF boards place their connectors on the back of the PCB, so the case tray needs matching cutouts. The D400 supports BTF, but back-connect boards come in more than one vendor-specific layout. Check the manual to confirm that your board's connector positions line up. E-ATX is not listed, so treat large workstation boards as unsupported. ### Graphics card 450mm is generous, and most high-end GPUs fit on length alone. Thickness (slot count) and room to bend the power cable, such as a 12V-2x6 connector, also matter. The spec sheet does not say whether a side-mounted 360mm radiator or fans reduce the space available for the GPU. If you plan to combine side cooling with a large GPU, check the dimensional drawing in the manual first. ### CPU cooler Most dual-tower air coolers fit within 169mm, but anything taller will not fit. Coolers that overhang the RAM slots can also clash with tall memory heat spreaders. That clash depends on the board and cooler, not the case. ### PSU and storage The PSU is standard ATX (PS2). Maximum PSU length is not given in the specs, and high-wattage units tend to be longer, so check the product page or the manual. Drive bays are listed as 3.5-inch x1 / 2.5-inch x2, which may describe shared bays. Plan on one 3.5-inch HDD at most and rely on M.2 SSDs or external storage for capacity. ## Cooling Layouts Without front intake, deciding which way each fan and radiator blows is the key to building in this case. | Layout | Intake | Exhaust | Best for | |---|---|---|---| | Top 360mm AIO | Side 120mm x3 | Top radiator plus rear | A first build; the safest option | | Side 360mm radiator | Side radiator | Top fans plus rear | Prioritising CPU temperatures | | Dual 360 (top and side) | Side or PSU compartment | Top plus rear | Separate CPU and GPU loops | | Air cooler (169mm or less) | Side 120mm x3 | Top plus rear | Avoiding pump noise and leak risk | For a first build in this case, mount a 360mm AIO on top as exhaust and use the three side fans as intake. Air enters from the side and CPU heat leaves through the top, and the GPU gets cooler air. A side radiator set as intake lowers CPU temperatures, but it pushes warmed air over the GPU and VRM. With dual 360mm radiators, intake options narrow to the side or the PSU area. Keep the numbers of intake and exhaust fans roughly balanced, and watch how dust builds up. Included fans are not listed in the specs, so check the box contents on the product page. ## Product Info The D400 is a mid-tower with a metal and curved-glass build, finished in black. As of June 2026, Amazon. co. Prices change often and vary by seller, so check the current price before you buy. No overseas marketplace price was available when the data was collected. Because the listing comes from a third-party seller, an import markup may be included, so compare other sellers and stores. ## How It Compares - **If back-connect support matters most:** the LIANLI LANCOOL 217 INF is another mid-tower that supports back-connect boards. It uses an infinity-mirror front panel instead of curved glass. - **If you want something smaller:** if Micro-ATX is enough, a Micro-ATX case such as the Okinos Aqua 3 takes up less space. The D400 is 488mm deep. - **If you need E-ATX or many drives:** look at a full tower such as the Corsair Obsidian 750D, which supports E-ATX. - **If you prefer the same brand:** compare the D400 with other JONSBO cases such as the C6. ## Who It's For - Builders who want to fit a long flagship GPU and a 360mm AIO in one mid-tower - Enthusiasts planning a dual-360 layout with separate CPU and GPU loops - BTF board users who want as few visible cables as possible - Anyone building a curved-glass showcase PC as the centrepiece of their desk - Users whose storage is mostly M.2 and who need one 3.5-inch HDD at most It is not for NAS-style multi-HDD builds, coolers taller than 169mm, or anyone who simply wants a cheap, quiet box. ## Things to Check Before Buying **Price and seller. Check the seller's rating and return policy, and compare prices elsewhere. Listing details can be wrong, so confirm that the photos and title actually show the D400. **Minimal storage. ** One 3.5-inch drive is the limit on paper. **169mm cooler limit. ** Check your cooler's rated height. A few millimetres can stop the side panel from closing. **Side radiator clearance. ** The spec sheet does not say how a side 360mm radiator affects GPU or cooler clearance. Check the manual before planning a dual-360 build. **Plan your intake. ** With no front fan mounts listed, a build laid out for front intake will run warmer. **Front Type-C needs a header. ** The Type-C port only works if your motherboard has a front-panel Type-C header. **Combo audio jack. ** Headsets with separate mic and headphone plugs need a splitter. **BTF variants. ** Back-connect boards follow different layouts, so BTF support does not guarantee that every back-connect board fits. **Curved glass. ** A curved panel is hard to replace with a generic part, so handle and transport it carefully. **Depth. ** At 488mm deep, the case leaves little room for rear cables on a shallow desk. Weight is not listed. ## FAQ **Q. Will an RTX 4090-class card fit? ** A. The limit is 450mm, and most such cards are in the 300mm range, so length is very likely fine. Check the card's thickness, cable bend room and side-radiator clearance separately. **Q. Can I use a large air cooler? ** A. Yes, if it is 169mm or shorter. The Noctua NH-D15 is rated at 165mm, for example. **Q. Can I install two 3.5-inch HDDs? ** A. Not according to the specs. Only one 3.5-inch drive is supported. **Q. Are fans included? ** A. The specs do not say. Check the product page and budget for extra fans. **Q. Does it work with a normal ATX board? ** A. Yes. BTF support is optional, not required. ### 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.