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The JONSBO BO400CG is a pillar-free PC case built around curved tempered glass, with support for Mini-ITX, Micro-ATX, and ATX motherboards. JONSBO lists clearance for GPUs up to 435 mm, CPU air coolers up to 173 mm, and ATX PS2 power supplies up to 200 mm. Those are individual maximums, not a guarantee that every combination fits; check the installation guide against your planned components. This article covers the original BO400CG, not the separately listed BO400CG V2.
What makes the JONSBO BO400CG different?
The BO400CG omits a front glass-support pillar, giving the front and side of a build a more continuous view through curved tempered glass. JONSBO says the factory metal top cover can be replaced with the included glass top cover for a three-sided view through the top, front, and side. That describes the case’s display-oriented design; it does not establish any particular cooling or noise performance.
JONSBO lists the case materials as SPCC and SGCC steel, aluminum alloy, and tempered glass. Its dimensions with feet are 474 × 311 × 489 mm (depth × width × height). See the official BO400CG product page for the manufacturer’s specifications.
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Will your components fit?
These are the original BO400CG’s published limits. A listed maximum describes a supported dimension, not the clearance available in every configuration; check the component dimensions and installation layout before buying.
#1 Best Overall
- JONSBO TK-3 integrated glass ATX mid tower pc case, gabinete pc,separated cabinet case-One-piece Curved Glass: 270 Degree Side View Display,column-less,full display of hardware，High compatibility: ATX PSU, 40series GPU, BTF Motherboard. Tips: No tear off the curved-glass explosion-proof film
- 【Separated cabinet case】: Support back plane (BTF) motherboard，ATX/Micro-ATX/ITX One-piece Curved Glass,Easier to build your PC,More convenient.
- 【Cooling system 】: Support Dual 360 AIO (up/down)/10fan positions (Vertical upward path without heat accumulation)
- 【PSU Support】: ATX 220mm/8.66inch 【Max.CPU Cooler】:H165mm/6.49inch 【Max.GPU】:L 420mm/16.53inch 【Cooling System】: Top120mm*3/140mm*2(Optional)OR AIO360x1 or 280x1 Bottom120mm*3(Optional)OR AIO 360mmx1 MB Side120mm*3(Optional) Rear120mm*1(Optional) 【Drive Bay】:2.5SSD*2 +3.5HDD*1 OR 3.5HDD*2+2.5SSD*1
- 【Specification】 Front I/O Port:1*USB3.2 Gen2 Type-C/2*USB3.0 Size:288mm(W) * 438mm(D) * 415mm(H) ( Included the foot) Material: 0.7mm Steel PCI Expansion Slot:7
| Component or feature | BO400CG specification |
|---|---|
| Motherboard | Mini-ITX, Micro-ATX, or ATX; JONSBO also states support for back-connect motherboard designs |
| Graphics card | Up to 435 mm long |
| CPU air cooler | Up to 173 mm high |
| Power supply | ATX PS2, up to 200 mm long |
| Expansion slots | 8 |
| Storage | Up to four 3.5-inch drives; up to two 2.5-inch drives, sharing mounts with two of the 3.5-inch positions |
Check the full build, not just GPU length
For a graphics card, compare the card’s full dimensions with the case layout and any other hardware occupying nearby space. Also check the cooler height and PSU length independently. The official BO400CG user guide is the relevant reference for installation clearances and mounting arrangements.
Fans and radiator support
JONSBO lists fan mounting points at the top, side, rear, and bottom. The product page and earlier manual do not present identical radiator summaries, so the exact revision and intended position matter when planning liquid cooling.
Rank #2
- JONSBO D400 BLACK PC Case,ATX /MATX/Mini-ITX BTF Motherboard Desktop Case- Size : 488x239x514mm/19.21x9.21x20.43 inch
- 【Three-dimensional, beveled, curved glass design 】:Hardwares inside clearly, Easier to build your PC,More convenient.
- 【GPU 】 ≤450mm Easier to build your PC,More convenient.【PSU support】: ATX PS2 ,Suitable for game pc case expansion.
- 【Air-cooling support】: 169mm(Max. Height ) 【AIO support】: Top 240mm / 280mm / 360mm*1 (optional); Side 360mm*1(optional)
- 【10 fan positions】 - Top 120mm*3/140*2(optional); Side 120mm*3(optional); Rear 120mm*1(optional); Power Compartment 120mm*3(optional)
| Position | Fan support | Radiator support stated by JONSBO |
|---|---|---|
| Top | 3 × 120 mm or 2 × 140 mm | Product page: 240/280/360 mm; manual: 240/280/360 mm |
| Side | 3 × 120 mm | Product page: 360 mm; manual: 240/360 mm |
| Rear | 1 × 120 mm | Not stated in the cited product-page or manual summaries |
| Bottom | 3 × 120 mm or 2 × 140 mm | Product page: 240/280/360 mm; not stated in the manual summary |
The product page lists bottom radiator support up to 360 mm, while the earlier manual summary omits bottom radiator support. The manual also lists 240 mm side-radiator support, which the product-page summary does not. Confirm the intended mounting plan in the guide for the exact case revision rather than assuming every listed radiator size fits every position. The listed fan mounts and radiator support do not mean fans or a liquid cooler are included.
Front-panel connections
The BO400CG front I/O includes two USB 3.2 Gen 1 Type-A ports, one USB 3.2 Gen 2 Type-C port, and a headset/audio connection, according to JONSBO’s product specifications.
Rank #3
- Case Design: JONSBO TK-4 Separated Cabinet PC Case, ATX Computer Case- Bi-Bent Surround View Glass :Hardwares inside clearly, with 2H hardness glass protection film applied to glass surfaces Tips: No tear off the curved-glass explosion-proof film
- Material Construction: Premium aluminum alloy construction providing durability and enhanced thermal performance Material : SGCC 1.0mm /Plastic / Glass:4mm / AL 2.0mm
- Motherboard Compatibility: Supports multiple form factors including ITX, M-ATX, and ATX with back-connect (BTF) motherboard support
- Component Clearance: Accommodates 【graphics cards/GPU】 up to 460mm/18.11 inch in length and 【power 】supplies up to 200mm/7.87 inch
- Case with improved cooling : Large area cooling grilles on the back panel 【With 9 fan positions】,【Dual 420 AIO】 mounting positions (Top, Bottom) 【Air Cooler】:175mm/6.89 inch
BO400CG vs. BO400CG V2
JONSBO lists the BO400CG and BO400CG V2 as separate products. The title here refers to the original BO400CG: its product page links an installation manual dated 2025-09-01. The V2 page lists a V2 installation manual dated 2026-07-14. Although the headline clearances and core layout are similar, do not assume that specifications or installation details for one revision automatically apply to the other. Check the model name on the case listing and use its matching product information. The separate BO400CG V2 product page identifies that later model.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the specifications do—and do not—tell you
The published dimensions and mounting limits help establish physical compatibility. They do not show measured temperatures, fan noise, build difficulty, or comparative performance. No performance conclusion should be drawn from the listed clearances or cooling mounts alone.
Quick Recap
Rank #4
- JONSBO D401 ATX PC Case-High strength alloy frame forming process
- 【BTF ATX Motherboard】Supports ATX/Micro-ATX back-connect motherboards, providing a more concise internal hardware visual environmen.【Tool free buckle opening mid tower PC Case】Easier to build your PC,More convenient.
- 【GPU length: 427mm】The computer case supports vertical GPU installation for GPU lighting effects display Note: The vertical GPU installation mode requires purchasing a GPU conversion bracket and PCI-E extension cable separately
- 【Cooling system】 :10 fan positions(Optional),Fan support: Top 3×120mm/2×140mm ,Back 1×120mm ,Side 3×120mm ,Bottom 3×120mm 【AIO】:Top 240/280/360 AIO Side 360 AIO，【Air Cooler height】: 169mm
- 【ATX PS2 PSU】 length: <200mm，【Drive bay】:2.5"SSD*2 or 3.5"HHD*1+2.5"SSD*1 / 2.5"SSD*1 or 3.5"HDD*1
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
