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Cooler Master

Cooler Master Q300L V1 Micro-ATX PC Case

Computer Case

4.5/ 5 on Amazon14,000Amazon ratings1,000+bought last month2.7ProductDome score

More reviewed than 94%

Limited evidenceUpdated 6 days agoAmazon data + ProductDome analysis · methodology

Best forYou are building a micro-atx or mini-itx system and need room for a 360mm gpu or 240mm liquid cooler.

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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Styles Available

Q300LQ300L V3

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ProductDome scorecard

How it ranks among the 17 computer cases we track

2.7/ 5ProductDome scoreLimited evidence

Owner satisfaction · 56% of scorecategory median 4.7★4.5

4.5★ across 14,000 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 1,100 ratings5.0

14,000 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score4.1

1,000+ bought on Amazon last month.

Data quality · 11% of score2.5

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 17 computer cases we track - how the scorecard works · full computer cases data report. Confidence: limited - incomplete product information.Updated 6 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

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.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

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

What to check first

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

How it compares

This product against the closest alternatives we track in computer cases.

Product	Amazon rating	Ratings	ProductDome score
Cooler Master Q300L V1 Micro-ATX PC CaseThis product	4.5 / 5	14,000	2.7 / 5
NZXT H6 Flow \| CC-H61FB-01 \| Compact Dual-Chamber Mid-Tower Airflow Case \| Panoramic…NZXT	4.8 / 5	3,000	4.6 / 5
CORSAIR 4000D RS ARGB Frame Modular Mid-Tower ATX PC CaseCorsair	4.7 / 5	1,800	4.6 / 5
Fractal Design North Charcoal Black Tempered Glass DarkFractal	4.7 / 5	3,500	4.4 / 5
Geekworm P173 Heavy Duty Passive Cooling Aluminum Case for Raspberry Pi 4Geekworm	4.8 / 5	2,500	4.4 / 5

Frequently asked

Questions about the Cooler Master computer cases

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

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.