Cooler Master Q300L V1 Micro-ATX PC Case
- Case Type: Mini-Tower
- Supported Motherboard: Micro ATX And Mini ITX
- Cooling Method: Air
- Number of Fans: 3
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A solid pick for a compact build needing real GPU and AIO clearance, though its open airflow design is not built for a silent room.
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ASIN: B0785GRMPGModel: MCB-Q300L-KANN-S00Category: Computer Cases
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Overview
Cooler Master's Q300L V1 is a compact Micro-ATX case with a transparent side panel and clearance for a 360mm graphics card or a 240mm liquid cooler, built around airflow rather than a silent room.
Perforated panels on multiple sides paired with magnetic dust filters are the case's main design bet, moving air through up to 5 fans and a 240mm radiator rather than sealing the build in. A modular I/O panel can be repositioned to the front, top or bottom of either side, which matters more in a compact case where cable routing and desk placement are tighter.
- Micro-ATX/Mini-ITX case with edge-to-edge transparent panel
- GPU clearance up to 360mm, PSU up to 160mm
- 240mm liquid cooling support across up to 5 fans
- Modular I/O panel: front, top or bottom placement
Who it's for
It fits builders working with Micro-ATX or Mini-ITX motherboards who still want room for a full-size GPU or AIO cooler in a small footprint. It is not the right shell for a full ATX build or for anyone prioritizing a quiet, sealed case over airflow.
Pros and cons
- Fits GPUs up to 360mm in a compact case
- Supports a 240mm AIO with 5 fans
- Modular I/O panel moves to 3 positions
- Magnetic dust filters and transparent side panel
- Perforated shell trades quiet running for airflow
- PSU length limited to 160mm
- CPU cooler height capped at 159mm
Performance notes
The clearance numbers set the ceiling on what fits: a 159mm tall CPU cooler, a 360mm graphics card and a 160mm power supply, which covers most mainstream builds inside a Micro-ATX footprint. The perforated shell and magnetic filters trade some noise dampening for the airflow needed to keep a 240mm AIO and multiple fans running cool.
Specifications
| Brand | Cooler Master |
|---|---|
| Model | MCB-Q300L-KANN-S00 |
| Dimensions & fit | |
| Item Weight | 1.06 pounds |
| Item Dimensions D x W x H | 15.4 × 9.1 × 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 |
| 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 |
| Total Usb Ports | 2 |
| Number of Items | 1 |
| Antenna Location | Gaming |
| Mfr Part Number | MCB-Q300L-KANN-S00 |
| BuiltIn Media | 1 Computer Case |
| Item Type Name | grocery |
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Frequently asked questions
What size graphics card fits in the Cooler Master Q300L V1?
Cooler Master rates GPU clearance up to 360mm, which covers most consumer cards even in this compact Micro-ATX case.
Does the Q300L V1 support liquid cooling?
Yes, it supports up to a 240mm AIO radiator along with up to 5 fans total for airflow.
Is the Cooler Master Q300L V1 built for Micro-ATX or full ATX motherboards?
It is sized for Micro-ATX or Mini-ITX motherboards, not full ATX.