PC Case Thermaltake 300 Racing Green Micro Tower

The Thermaltake 300 Racing Green Micro Tower is a compact micro-ATX PC case with a vertical octagonal-prism design that prioritizes airflow and hardware compatibility. It supports GPUs up to 400 mm (without power cover), standard ATX power supplies up to 220 mm, CPU coolers up to 210 mm height, and can house up to three 2.5" SSDs or three 3.5" HDDs. The case accepts multiple fan configurations including up to eight 120/140 mm fans and can accommodate a 420/360 mm AIO radiator on the right side. Front and side panels include tempered glass and perforated panels with tool-free removal; top I/O provides one USB-C (USB 3.2 Gen 2) and two USB 3.0 ports.

Advantages

The micro tower delivers strong cooling options with pre-installed CT140 140 mm PWM fans and support for up to a 420 mm radiator on the right, while maintaining a relatively small footprint due to its octagonal vertical design. Tool-free tempered glass and perforated panels simplify access, and modular components such as a removable fan bracket and optional LCD Screen Kit or chassis stand allow customization. Dust filters on top, rear, inner sides and bottom improve long-term maintenance.

Suitable for

• Compact gaming builds with high-end GPUs (up to 400 mm)
• Systems requiring strong AIO or multiple-fan cooling (supports 420/360 mm radiator)
• Micro-ATX or Mini-ITX motherboards where a small footprint is preferred
• Customizable showcase builds using tempered glass panels and optional LCD or stand kits

Key specifications

• Form factor: Micro Tower / supports Micro-ATX, Mini-ITX
• GPU clearance: up to 400 mm (without power cover)
• PSU length: up to 220 mm
• CPU cooler height: up to 210 mm
• Drive bays: up to three 2.5" SSDs or three 3.5" HDDs
• Fan support: up to eight 120/140 mm fans; two CT140 pre-installed
• Radiator support (right side): 420 mm / 360 mm
• Front/side panels: three 3 mm tempered glass (front) and perforated side panels; tool-free
• I/O ports: 1 × USB 3.2 Gen 2 Type-C, 2 × USB 3.0
• Material: SPCC; Product colour: Green
• Weight: 8.3 kg

How to use

Install a Micro-ATX or Mini-ITX motherboard and route cables behind the PSU cover. Use the removable fan bracket on the right side to install either three 120/140 mm fans or a 420/360 mm AIO radiator; for radiator installations, follow manufacturer guidance and position the radiator higher than the AIO pump when placing the chassis horizontally with an optional stand. Mount storage drives in the available 2.5" or 3.5" bays, install the power supply up to 220 mm, and connect front-panel USB-C and USB 3.0 ports to the motherboard headers. Tempered glass and perforated panels are tool-free for easy access during assembly and maintenance.

Recommendations

For optimal cooling, keep the radiator positioned above the pump when using horizontal placement with the chassis stand kit, maintain dust filters regularly, and use the removable fan bracket to simplify radiator or fan upgrades.