Meet the Jonsbo U4 Mini, a compact MATX/ITX chassis engineered to balance small footprint with big‑time versatility. With a footprint just 222mm wide and a depth of 440mm, this desk‑top friendly case fits neatly into tight setups while still offering substantial internal room for high‑performance components.

Key features

• Color options: Black or White
• Dimensions: 222mm (W) × 440mm (D) × 385mm (H)
• Material: Steel construction using 1.2mm and 0.6mm sheets for sturdiness and durability
• Motherboard compatibility: ITX and M‑ATX
• Drive bays: 1 × 2.5" SSD, 1 × 3.5" HDD
• Cooling options (all case‑topology dependent and optional): Bottom supports 120mm×3 or 140mm×2; Top supports 120mm×3; Back supports 120mm×1
• Power supply compatibility: ATX ≤ 145mm–200mm (length range provided)
• Maximum CPU cooler height: ≤ 165mm
• Maximum GPU length: ≤ 330–420mm
• Front I/O: USB 3.2 Gen2 Type‑C × 1, USB 3.0 × 1, Audio + Microphone (2‑in‑1) × 1

Smart cooling and flexible layout

This chassis is designed to balance airflow and component clearance. The bottom chamber accommodates up to three 120mm fans or two 140mm fans, while the top can house up to three 120mm fans for robust intake and exhaust. A dedicated back fan slot adds a targeted airflow path to critical components, helping maintain steadier temperatures in compact builds.

Storage and expansion you can rely on

Two straightforward drive bays—one 2.5" SSD and one 3.5" HDD—offer essential storage without sacrificing space. The generous GPU clearance and CPU cooler height allowance provide flexibility for mid‑range to high‑end graphics cards and cooling solutions, letting you build a capable system in a compact frame.

Connectivity and convenience

Front‑panel connectivity is streamlined for modern builds: a USB 3.2 Gen2 Type‑C port for fast transfers, a USB 3.0 port, and a combined audio/microphone jack. This setup keeps essential connections within easy reach while preserving a clean, minimal aesthetic.

Who this is for

• Enthusiasts building compact ITX or micro‑ATX systems who need ample GPU length and cooling headroom
• Compact workstation or living room PC builds where space matters but performance shouldn’t be sacrificed
• Users seeking a steel, durable chassis with straightforward drive options and modern front I/O