Cooler Master Q300L V1 Micro-ATX PC Case
- Micro-ATX and Mini-ITX boards, mini-tower body
- 360mm graphics card support and **240mm AIO support**
- 3 fans on an air-cooled layout
- 4 expansion slots, bottom-mounted power supply up to 500 watts
- 2 USB ports on a modular I/O panel
- 1 internal bay for a 3.5 inch drive
- 15.39 x 9.06 x 15 inches (D x W x H)
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact case for small builds, with magnetic dust filters and a see-through window. Board support stops at Micro-ATX, so a full-size motherboard will not go in.
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ASIN: B0785GRMPGModel: MCB-Q300L-KANN-S00Category: Computer Cases
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Overview
A builder assembling a small gaming or office PC gets a mini-tower shell with a transparent side panel and an edge-to-edge front. The power supply mounts at the bottom, and the dust filters attach magnetically so they lift off without tools.
Small cases usually force a choice between airflow and size, and this one leans toward airflow with a fully ventilated body and several fans. The limitation is room: one internal drive bay and a board size ceiling mean it suits a lean build rather than a storage-heavy one.
Who it's for
A desk-side build with a small footprint and a transparent panel to show the parts is the situation here. Builders planning a large drive array or a full-size board should choose a bigger tower.
Pros and cons
- Magnetic dust filters lift off easily
- Transparent panel shows the build
- Fully ventilated body for airflow
- Modular I/O panel
- Single internal drive bay
- Motherboard support stops at Micro-ATX
- Maximum cooler height not listed
- Plastic and alloy steel body only
Performance notes
Airflow depends on the fully ventilated shell and the included fans pulling air across the board. The filters catch dust at the intake, so cleaning them matters more than the fan count over time. Radiator and graphics card length limits come from the case interior, which is why the listed support sizes are the numbers to check against your parts.
Specifications
| Brand | Cooler Master |
|---|---|
| Model | MCB-Q300L-KANN-S00 |
| Dimensions & fit | |
| Gpu clearance | 360mm |
| Item Dimensions D x W x H | 15.39 x 9.06 x 15 inches |
| Capacity & performance | |
| Cooling Method | Air |
| Power supply maximum output | 500 watts |
| Power & efficiency | |
| Power Supply Mounting Type | Bottom mount |
| Construction & materials | |
| Enclosure Material | Alloy steel, plastic |
| Color | Dark Gray |
| Warranty & support | |
| Supported Motherboard | Micro-ATX and Mini-ITX |
| Radiator support | 240mm |
| Other details | |
| Case Type | Mini-Tower |
| Number of Fans | 3 |
| Total Expansion Slots Quantity | 4 |
| Internal Bays Quantity | 1 |
| Hard Disk Form Factor | 3.5 inches |
| Total USB 30 Ports | 2 |
| Antenna Location | Gaming |
| Item Type Name | grocery |
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Frequently asked questions
How do I install a graphics card in the Cooler Master Q300L?
The listing gives four expansion slots and graphics card support up to 360mm. Check your card length against that figure before buying, because the listing gives no other clearance numbers.
What motherboards fit the Cooler Master Q300L V1?
Micro-ATX and Mini-ITX boards. Full-size ATX boards are not in the supported list.
Is the Q300L V1 a full tower?
No. It is listed as a mini-tower with one internal 3.5 inch bay, so it is built for compact systems.