Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)

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 Halo
MK770
MM712
Add to Cart </form>
Add to Cart </form>
Add to Cart </form>
Add to Cart </form>
Add to Cart </form>
Add to Cart </form>
Customer Reviews
4.5 out of 5 stars
12,460
3.9 out of 5 stars
104
4.7 out of 5 stars
7,943
4.8 out of 5 stars
60
4.1 out of 5 stars
5
4.0 out of 5 stars
163
Price $39.99$39.99$139.99$139.99$30.49$30.49$19.99$19.99$102.00$102.00$50.00$50.00
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 Halo RGB Backlighting | PBT Double-Shot Keycaps 6 Buttons | 58g Weight
360mm GPU Clearances Fully Modular Halo 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"
The Master Box Q300L is your straightforward option in the lineup of the brand new Master Box Series from Cooler Master. A Series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldn't tell, the Master Box Q300L supports a standard ATX PSU which we don't see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best. Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the Master Box Q300L The perfect choice for office and home.