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Cooler Master Q300L V3 Micro-ATX PC Case, High Airflow, Tempered Glass 366mm Graphics Card Support, 240mm AIO Support, Micro-ATX Motherboard, Magnetic Dust Filters, Customizable Modular I/O Panel

Builder-Friendly Design: Feature rich Micro ATX case with high-airflow cooling, flexible hardware support, and a compact layout that delivers premium performance without compromising on quality.
Fits High-Performance GPUs: Supports graphics cards up to 366mm, making it easy to build with today's NVIDIA GeForce RTX and AMD Radeon gaming graphics cards
High Airflow Cooling: Fit 6x 120mm or 140mm fans, 240mm AIO radiators, and 178mm CPU air coolers, for flexible cooling for gaming and productivity.
Modular Everyday Design: Supports ATX power supplies up to 200mm and features a movable I/O panel, magnetic dust filters, tempered glass, and clean cable management for hassle-free builds.
Complete Your High-Airflow Build: Pair with the Cooler Master V4 Alpha 3DHP Air Cooler, MasterFan M120, and MWE Gold 850 V3 PSU for powerful cooling, reliable power, and optimized airflow.

Overview

Specs

Reviews

Model
Brand	Cooler Master
Model	Q300LV3-KGNN-S00

Front Panel Ports
Front Ports	2 x USB 3.2 Gen1 Type-A 1 x USB 3.2 Gen 2x2 Type-C 1 x 3.5 Mic / Audio Combo Jack x1

Cooling System
Fan Options	Bottom - 1 x 120mm / Bottom - 1 x 140mm / Front - 2 x 120mm / Front - 2 x 140mm / Rear - 1 x 120mm / Rear - 1 x 140mm / Top - 2 x 120mm / Top - 2 x 140mm
Pre-installed Fans	Rear - 1 x 140mm
Radiator Options	Front - Up to 120mm / Front - Up to 240mm / Rear - Up to 120mm / Top - Up to 120mm / Top - Up to 240mm

Dimensions & Weight
Max GPU Length	366 mm
Max CPU Cooler Height	178 mm
Max PSU Length	200mm (without bottom fan installed) 140mm (with bottom fan installed)
Dimensions	386.1 x 230 x 429.4 mm \| 15.2 x 9.1 x 16.9
Weight	4.5kg

Additional Information
First Listed on Newegg	September 23, 2026

Warranty & Returns