The Chieftec CI-03B-OP, known as “The Cube,” is a newly released compact mATX cube chassis designed for modern PC builds, particularly those emphasizing minimalist aesthetics and multifunctional use in small spaces. Drawing inspiration from Hi-Fi audio equipment and furniture craftsmanship, it features a sleek black finish with a unique circular vent on the front covered in breathable fabric, evoking the look of a subwoofer speaker while ensuring efficient airflow for the pre-installed 200mm PWM fan equipped with a long-life HDB bearing for quieter operation. This innovative design allows the case to blend seamlessly into home environments, whether for gaming, multimedia setups, or everyday computing, and includes an easy-access fold-open mechanism that simplifies hardware installation without the need for extensive disassembly.
Source: Chieftec
In terms of specifications, the CI-03B-OP measures 385 mm in depth, 265 mm in width, and 355 mm in height, with a chassis weight of 4.64 kg (5.61 kg packaged), constructed from durable 0.6 mm SPCC steel. It supports Mini-ITX and mATX motherboards, up to four expansion slots, ATX power supplies with a maximum length of 160 mm, CPU coolers up to 160 mm tall, and graphics cards extending up to 335 mm long. Storage options are versatile, accommodating two 3.5-inch HDDs and two 2.5-inch SSDs internally, with no external drive bays. Front I/O connectivity is comprehensive, including one USB 3.2 Gen 2 Type-C port, two USB 3.0 ports, and separate 3.5 mm audio jacks for headphones/speakers (AZALIA/HD-Audio compliant) and microphone input. The package includes a screw set, instruction manual, and a removable bottom dust filter for maintenance ease.
Source: Chieftec
Cooling flexibility stands out as a key feature, catering to both air and liquid setups in its compact form. A single 200mm PWM fan comes pre-installed at the front for intake, with support for an additional 120mm fan at the rear for exhaust. The top panel allows for two 120mm fans, one 200mm fan, or a 240mm radiator, making it suitable for high-performance components without compromising the cube’s small footprint. This setup ensures effective thermal management, ideal for users building powerful yet quiet systems.
Source: Chieftec
Priced starting from around 70 euros, the CI-03B-OP is positioned as an affordable entry into premium small-form-factor cases, backed by a 24-month warranty and certifications including CE, RoHS, and WEEE for environmental compliance. Availability is rolling out through Chieftec’s global distributors, with the product highlighted in recent tech reviews and announcements as of late 2025, emphasizing its evolution from earlier Cube models to meet contemporary demands for style, silence, and scalability.
Source: Chieftec via NotebookCheck
