PC Case Thermaltake 300 Matcha Green Micro Tower

The Tower 300 Matcha Green is a micro-ATX PC case in an octagonal prism shape that keeps a vertical chassis profile while reducing footprint and improving workspace flexibility. It supports high-end hardware, including a 4090-class GPU (up to 400mm without the power cover), standard ATX power supplies up to 220mm, a CPU cooler up to 210mm tall, and up to three 2.5" SSDs or three 3.5" HDDs. The case accepts a right-side AIO radiator up to 420mm and ships with two pre-installed 140mm PWM fans on the top for immediate airflow.

Advantages

The Tower 300 Matcha Green combines compact vertical styling with broad compatibility: removable modular panels and a removable fan bracket simplify installation, three tempered glass panels and perforated side panels provide easy tool-free access, and multiple dust filters protect internal components. The case supports flexible cooling configurations (up to eight 120/140mm fans in total) and offers front/top I/O including one USB 3.2 Gen 2 Type-C and two USB 3.0 ports. Optional accessories such as a 3.9" LCD Screen Kit and a Chassis Stand Kit enable horizontal placement and real-time component monitoring.

Suitable for

• Compact gaming builds using Micro-ATX or Mini-ITX motherboards
• Systems requiring strong cooling: right-side 420mm AIO or multiple 120/140mm fans
• Builds needing up to three 2.5" SSDs or three 3.5" HDDs
• Users who want a distinctive case appearance with optional LCD or horizontal stand

Key specifications

• Form factor: Micro Tower (supports Micro-ATX, Mini-ITX)
• Maximum GPU length: 400mm (without power cover)
• Maximum CPU cooler height: 210mm
• PSU length support: up to 220mm
• Right-side AIO support: up to 420mm (also supports 360mm)
• Pre-installed fans: two 140mm CT140 PWM fans (top)
• Fan support: up to eight 120mm/140mm fans across top, back, PSU cover and right bracket
• Storage support: up to three 2.5" SSDs or three 3.5" HDDs
• Front/top I/O: 1× USB 3.2 Gen 2 Type-C, 2× USB 3.0
• Panels: three 3mm tempered glass front panels and two perforated side panels (tool-free)
• Material: SPCC; Colour: Matcha Green

How to use

Install the motherboard (Micro-ATX or Mini-ITX) and mount storage and PSU according to standard PC assembly procedures. To install a right-side AIO radiator, remove the detachable fan bracket on the right side and fit either up to three 120/140mm fans or a 420mm/360mm radiator. Tool-free tempered glass and perforated panels allow easy access for cable routing and component installation. If using the optional Chassis Stand Kit for horizontal placement, remove the original feet from the base, attach the new bottom cover, and place the case on the provided stand; position the radiator higher than the AIO pump as recommended.

Recommendations

For optimal cooling, use the pre-installed CT140 fans with additional intake/exhaust fans as needed, keep the dust filters clean, and when installing an AIO radiator on the right side position the radiator above the pump to reduce air trapping. Consider the optional LCD Screen Kit or Chassis Stand Kit for monitoring and alternative display orientation.