Cooler Master MasterBox Q300L

Mini Tower Black modular case - transparent side panel

Pictures may differ from actual products

The MasterBox Q300L from Cooler Master is a mini tower case that can be placed vertically or horizontally. Its transparent wall gives you a permanent view of your entire configuration, whether it is a micro-ATX or mini-ITX motherboard.

Mini Tower Black modular case - transparent side panel

Overview

A small case with many possibilities

The MasterBox Q300L from Cooler Master is a mini-tower case that can be placed vertically or horizontally. Its transparent wall gives you a permanent view of your entire configuration, whether from a micro-ATX or mini-ITXmotherboard.

Small and spacious

The Cooler Master Q300L MasterBox can accommodate micro-ATX or mini-ITX motherboards to build a powerful gaming setup. The case will accommodate a 360mm graphics card and the processor will be cooled by a cooler with a maximum height of 157mm. There are also 4 PCI slots for expansion cards for your future PC. On the storage side, you can install one 3.5" and two 2.5" disks. The Q300L can be placed vertically or horizontally depending on the space available and your wishes.

High performance cooling

The Cooler MasterBox Q300L supports up to 6 fans (with a 120mm fan pre-installed at the rear) and is compatible with both 120 and 240mm watercooling systems. It is also equipped with a magnetic dust filter on the bottom. This allows you to create an efficient ventilation system to keep your components cool.

  • Front: 2 x 120/140 mm or watercooling 120/240 mm
  • Rear: 1 x 120 mm installed or watercooling 120 mm
  • Top: 2 x 120 mm
  • Bottom: 1 x 120 mm

Main features :

  • Compact gaming mini tower case
  • The case can be installed vertically or horizontally
  • 6 different I/O panel positions possible
  • Maximum length of graphics card: 360 mm
  • Maximum height of the cooling unit: 157 mm
  • 2 x 2.5" bays and 1 x 3.5" bay
  • Compatible with 120 and 240 mm watercooling
  • 6 fan slots
  • Magnetic dust filter on the bottom
  • 3 USB 3.0 ports
  • Dimensions: 387 x 230 x 378 mm
  • Weight : 3.7 kg
Specifications
Select your criteria

General information

Product name

Cooler Master MasterBox Q300L

Brand

Cooler Master Ltd

Model

MCB-Q300L-KANN-S00

Main characteristics

Graphic card max. length

360 mm

Max height CPU fan

157 mm

Power supply max. length

160 mm

Power format

ATX/EPS

Case format

Mini tower

Use

Gamer
Office

Material

Steel
ABS (Plastic)

Motherboard format

Micro ATX
Mini ITX

Power supply supplied

No

Design

Screwless fixing system

No

Case color

Black

Front color

Black

Dust filters

1

Integrated display

No

Glass

Yes

LED RGB

No

Water cooling compatible

Yes

Motherboard connector location

Standard connectors (on the motherboard)

Expansion slots

Number of PCI slots

4

Low profile

No

Number of visible 3.5" slots

0

Number of invisible 3.5" slots

1

Number of 2.5" slots

2

Number of 2.5"/3.5" slots

0

Number of visible 5.25" slots

0

Number of invisible 5.25" slots

0

Number of Slot-in slim 5.25'' slots

0

Number of Slim 5.25'' slots

0

Front connectivity

Location of expansion ports

Side

Connector(s) available

Microphone (3.5mm Jack Female)
Headphone (3.5mm Jack Female)
2 X USB 3.0

Cooling

Number of rear fan(s) slots

1 X 120mm

Quantity of rear fan(s) supplied

1

Number of front fan(s) slots

2 X 120 or 140mm

Quantity of front fan(s) supplied

0

Number of above fan(s) slots

2 X 120mm

Quantity of above fan(s) supplied

0

Water cooling

AIO radiator compatibility

120mm radiator
240mm radiator

Front AIO slot(s)

120mm radiator
240mm radiator

Rear AIO slot(s)

120mm radiator

Physical characteristics

Width

230 mm

Height

378 mm

Depth

378 mm

Weight

3.7 kg

Volume

33.65 l

Warranties

Commercial warranty

Seller 3 years

Legal warranty

See terms & conditions

Product referenced on 13 Mar 2018

Customer reviews
  • 50%
    14 reviews
  • 39%
    11 reviews
  • 7%
    2 reviews
  • 4%
    1 review
  • 0%
  • by TheoW
    Posted on 1 Dec 2023
    Product bought from LDLC on 2 Nov 2023
    Number of reviews: 1 Average rating: 6

    Mitigated

    Very attractive case but only 1 ventirad so the PC heats up a lot. It's a shame
    Good value for money

    Review automatically translated
  • by EmelineG
    Posted on 28 Nov 2023
    Product bought from LDLC on 30 Oct 2023
    Number of reviews: 1 Average rating: 10

    Top

    Good quality product! Quite spacious for a mini-tower and very well laid out. Very fast delivery.

    Review automatically translated
  • by nap
    Posted on 10 Jul 2023
    Product bought from LDLC on 11 Jun 2023
    Number of reviews: 3 Average rating: 9

    Suitable for its price

    Clearly not a top-of-the-range box, or even a mid-range one, but for the price, it does the job.

    There's nothing wrong with Ryzen 3600 and 6750xt for this case.

    Review automatically translated
  • by Mathieu B
    Posted on 5 Jul 2023
    Product bought from LDLC on 15 Jan 2021
    Number of reviews: 11 Average rating: 9

    small box, but doesn't cut

    Well, it's been 2 years of relatively regular tinkering and this tower hasn't yet cut my finger (I've lost count of the number of cuts I've suffered on 'scrap' office towers). So it does the job 5 stars.

    Review automatically translated
  • by NicolasC
    Posted on 15 Sep 2022
    Product bought from LDLC on 17 Aug 2022
    Number of reviews: 1 Average rating: 10

    Efficiency and speed

    Shipped quickly and matches the description perfectly. The price is unbeatable. The website is great and the information is detailed.

    Review automatically translated

In the same universe: case | cooler master masterbox q300l - micro atx | cooler master | q300l | cooler master masterbox q300l