Cooler Master MasterBox Q300 Series

Cooler Master MasterBox Q300 Series is the newest addition to one of the biggest manufacturers of PC chassis. It consists of two very distinct and unique looking cases – MasterBox Q300P and MasterBox Q300L. Both of them feature excellent technology and design from Cooler Master. Let’s take a closer look at the technical details and also what makes these cases so special.

MasterBox Q300P

Coming in at (LxWxH) 450 x 230 x 450mm of physical dimensions, made of steel and having black exterior and interior color, Masterbox Q300P has a lot to offer in the customization aspect. It supports Micro-ATX and Mini-ITX motherboards, but one of the main features and highlights of this case is the RGB lighting, which quite the thing nowadays. You can choose almost whatever color you want and make your system look crazy purple or aggressive red. Why not cool blue? The included RGB controller makes it possible for you to do that at all times.

Removable handles, four in total, serve the purpose for the case to be easily moved around and they also provide an extra interesting look. It’s great for LAN parties or if you move your PC often.

Yet another highlight of the case – edge to edge transparent panels to really show off the hardware, and to accompany that – a modular I/O that can be relocated to six different position on both sides of the case. It also holds two USB 3.0 ports and the audio jacks. If you think that’s impressive, the case can also stand in a different orientation. Both horizontal and vertical. Special rubber feet have been provided to avoid scratches and to also support the case on the surface.

On a side note, right behind the motherboard tray, Cooler Master has provided ample space for cable routing, an essential part of a great case – 28mm in total. Expansion slots for this case are total of 4, storage is sufficient with 3 bays, two of which are 2.5″ compatible and the other one can hold a 3.5″ drive.

Extra support in the cooling segment of the case is present, making sure to keep the hardware nice and cool:

Front: 120 / 140mm x 2, water cooling support here is 120mm x 1 / 240mm x 1 water cooling radiator.
Top: 120mm x 2
Rear: 120mm x 1, also compatible with 120mm x 1 water cooling radiator.
Bottom: 120mm x 1

To make the chassis even more appealing, great space has been designed and extra clearance is present to accommodate high-end solutions in terms of GPU and CPU coolers.

CPU Cooler: maximum of 157mm
PSU: maximum of 160mm
GPU: maximum of 360mm


MasterBox Q300L

Masterbox Q300L has some of the highlight features that Q300P shows, yet, it shines in another way. WIth a smaller size of (LxWxH) 387 x 230 x 378mm, made of steel, supporting the same Micro-ATX and Mini-ITX motherboards, Q300L is a stealth looking, clean design case. The dust filters included with it are magnetic and quite uniquely designed. They almost look like panels that you put on the case, but also have a very distinct pattern-like design with two shadows of grey. The exterior and interior of the case are black, making this a subtle combination.

Here we have the same type of edge to edge transparent side panels and modular I/O panel with two USB 3.0 ports and audio jacks. The design of the interior is the same, keeping all the same support in terms of cooling fans and water cooling radiators as Masterbox Q300P and having excellent thermal performance due to its open design – the front, top and bottom sides of the case are heavily perforated allowing for extra air to be moved in and out of the chassis.

This time we also have a handle at our disposal with Q300L and it can be mounted on the top panel. Again, support for both horizontal and vertical position of the chasis is available. Q330L is very similar to Q300P yet it’s aimed at a different client niche and it also maintains the same ample cooling capacity and efficient internal design.

Dobrin Krastev is the owner, reviewer and newsman of with more than 15 years' experience in personal computers, server and storage systems, UPS, peripheral devices and software. Passionate about testing and reviewing, AMD overclocking using AM3 990FXA and AMD FM2 A85X test systems and building modding projects.
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