Make It Yours.
We're all about the things that make building a PC such a rewarding experience. The sense of achievement. The joy of making and creating something uniquely yours in form and function and, of course, the thrill of bringing your creation to life without melting your components.
MasterBox Q300L
Choose Your Way
The MasterBox Q300L stands out as a straightforward choice within Cooler Master's MasterBox Q-series. While compact, this series excels in functionality, modularity, and thermal performance. The Q300L's blend of practical design and customizable aesthetic makes it an ideal option for both office and home environments.
- Magnetic Dust Filters
- 6-Orientation I/O Panel
- Edge-to-Edge Acrylic Side Panel
- Routing Space
- Thermal Performance
- ATX PSU Support
- CPU Cooler: 159mm, GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm
- Motherboard Support: Micro-ATX, Mini-ITX
Magnetic Dust Filters
The unique pattern of the dust filter adds a distinctive appearance to the case.
Components Clearance
Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length.
Versatile Cooling
Maximize cooling performance with a 240mm liquid cooler and 5 fans.
Modular I/O Panel
You have the flexibility to adjust its position at the front, top, or bottom on both sides.
Edge-To-Edge Panel
Show off your meticulous build through the transparent side panel with pride.
Open Thermal Design
The perforated design on all sides promotes optimal airflow and heat dissipation.
Ample Interior
Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion.
Routing Space
Enjoy 28mm of space behind the motherboard tray for efficient cable management and a tidy build.
 Q300L |  V850 SFX Gold ATX 3.0 |  Hyper 212 Halo |  MF120 Halo² |  MK770 |  MM712 | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — no data | — | — | — no data | — |
| Products | Micro-ATX Tower Case | SFX Power Supply | Air Cooler | Fan | Gaming Keyboard | Gaming Mouse |
| Compatible | ? | ? | ? | ? | ? | ? |
| Features | Up to 240mm Radiator Clearances | 80 PLUS Gold ATX3.0 | 154mm Cooler | 120mm | Kailh Box V2 Mechanical White|Red Switches | Palm |Claw Grip Type |
| 159mm Cooler Clearances | 850 Watts | Aluminum Top Cover | 51.8 CFM | 27 dBA Max | Hot-Swappable Switches | PixArt Optical Sensor | 70 Million | |
| 160mm PSU Clearances | SFX 12V Ver. 3.42 | Addressable Gen 2 RGB | PWM 0 to 2,050 RPM | 98 Key Layout | Space Gray | "RGB Backlighting | ABS Plasti c | Rubber | PTFE" | |
| Mini ITX | Micro-ATX | 90-Degree 12VHPWR Cable | 4 Heat Pipes | Dual Loop Halo² | RGB Backlighting | PBT Double-Shot Keycaps | 6 Buttons | 58g Weight | |
| 360mm GPU Clearances | Fully Modular | Halo² 120mm aRGB PWM | Addressable Gen 2 RGB | Wired | 2.4 GHz | Bluetooth 5.1 | Wired|2.4 GHz|Bluetooth 5.1 | |
| 120mm PWM | Japanese Capacitors | AMD AM5|AM4, Intel LGA 1700|1200|115X | ARGB Header Extender | 1ms Response Time | Acceleration 50g | |
| Up to 5x 120mm | 2x 140mm Fan | SFX-to-ATX Bracket | CryoFuze Thermal Paste | 120mm Case|Air Cooler |AIO Clearances | On-The-Fly | Multi-Media Keys | DPI 400|800|1200 (Default) Up to 19000 | |
| Dimensions (LxWxH) | 387 x 230 x 381mm | 100 x 125 x 63.5mm | 124 x 73 x 154mm | 120 x 120 x 25mm | 14.9 x 5.5 x 1.5" | 4.5 x 2.4 x 1.5" |
MasterBox Q300L
Make It Yours.
We're all about the things that make building a PC such a rewarding experience. The sense of achievement. The joy of making and creating something uniquely yours in form and function and, of course, the thrill of bringing your creation to life without melting your components.
Choose Your Way
The MasterBox Q300L stands out as a straightforward choice within Cooler Master's MasterBox Q-series. While compact, this series excels in functionality, modularity, and thermal performance. The Q300L's blend of practical design and customizable aesthetic makes it an ideal option for both office and home environments.
- Magnetic Dust Filters
- 6-Orientation I/O Panel
- Edge-to-Edge Acrylic Side Panel
- Routing Space
- Thermal Performance
- ATX PSU Support
- CPU Cooler: 159mm, GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm
- Motherboard Support: Micro-ATX, Mini-ITX
Magnetic Dust Filters
The unique pattern of the dust filter adds a distinctive appearance to the case.
Components Clearance
Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length.
Versatile Cooling
Maximize cooling performance with a 240mm liquid cooler and 5 fans.
Modular I/O Panel
You have the flexibility to adjust its position at the front, top, or bottom on both sides.
Edge-To-Edge Panel
Show off your meticulous build through the transparent side panel with pride.
Open Thermal Design
The perforated design on all sides promotes optimal airflow and heat dissipation.
Ample Interior
Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion.
Routing Space
Enjoy 28mm of space behind the motherboard tray for efficient cable management and a tidy build.
Q300L | V850 SFX Gold ATX 3.0 | Hyper 212 Halo | MF120 Halo² | MK770 | MM712 | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — no data | — | — | — no data | — |
| Products | Micro-ATX Tower Case | SFX Power Supply | Air Cooler | Fan | Gaming Keyboard | Gaming Mouse |
| Compatible | ? | ? | ? | ? | ? | ? |
| Features | Up to 240mm Radiator Clearances | 80 PLUS Gold ATX3.0 | 154mm Cooler | 120mm | Kailh Box V2 Mechanical White|Red Switches | Palm |Claw Grip Type |
| 159mm Cooler Clearances | 850 Watts | Aluminum Top Cover | 51.8 CFM | 27 dBA Max | Hot-Swappable Switches | PixArt Optical Sensor | 70 Million | |
| 160mm PSU Clearances | SFX 12V Ver. 3.42 | Addressable Gen 2 RGB | PWM 0 to 2,050 RPM | 98 Key Layout | Space Gray | "RGB Backlighting | ABS Plasti c | Rubber | PTFE" | |
| Mini ITX | Micro-ATX | 90-Degree 12VHPWR Cable | 4 Heat Pipes | Dual Loop Halo² | RGB Backlighting | PBT Double-Shot Keycaps | 6 Buttons | 58g Weight | |
| 360mm GPU Clearances | Fully Modular | Halo² 120mm aRGB PWM | Addressable Gen 2 RGB | Wired | 2.4 GHz | Bluetooth 5.1 | Wired|2.4 GHz|Bluetooth 5.1 | |
| 120mm PWM | Japanese Capacitors | AMD AM5|AM4, Intel LGA 1700|1200|115X | ARGB Header Extender | 1ms Response Time | Acceleration 50g | |
| Up to 5x 120mm | 2x 140mm Fan | SFX-to-ATX Bracket | CryoFuze Thermal Paste | 120mm Case|Air Cooler |AIO Clearances | On-The-Fly | Multi-Media Keys | DPI 400|800|1200 (Default) Up to 19000 | |
| Dimensions (LxWxH) | 387 x 230 x 381mm | 100 x 125 x 63.5mm | 124 x 73 x 154mm | 120 x 120 x 25mm | 14.9 x 5.5 x 1.5" | 4.5 x 2.4 x 1.5" |