Cooler Master MasterBox Q300L mATX Gaming Case w/ Window, Black

MX71011 MasterBox Q300L mATX Gaming Case w/ Window, Black
MX71011 MasterBox Q300L mATX Gaming Case w/ Window, Black MX71011 MasterBox Q300L mATX Gaming Case w/ Window, Black MX71011 MasterBox Q300L mATX Gaming Case w/ Window, Black MX71011 MasterBox Q300L mATX Gaming Case w/ Window, Black

Customer Reviews

Average Rating: With 3 Customer Reviews

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  • 1

One of the worst cases for airflow out of the box but could be good if you are comfortable cutting it apart

Submitted on Friday, May 29, 2020
By Emmanuel
From Calgary

Strengths of the product

- compact design at the cost of drive mounting options - in my setup i needed this case to fit onto a 19" shelf on my comm rack which it does perfectly - lots of mounting points for fans, specs are wrong on both coolermaster and memex website, this case holds 4x 140mm (top and bottom) and 2x 120mm (front and rear) - when modified cooling is decent (but this is somewhat true of all cases) - front panel IO and be moved which helped a lot for my HyperV server - hiding cables is pretty easy

Weaknesses of the product

- as stated on gamers nexus video review 80% of your fans is blocked rendering most cooling completely useless in this case - mikes unboxing also gave it a poor review due to its bad cooling design - the perforations look deceiving for airflow and one would think its good but does not help all, there is a reason why this case got the nick name "oven" - Cooler master if you are reading this, please use some common sense when it comes to designing cases around cooling and air flow - stop blocking the the fans to the point it renders them useless, air does not go through solid objects like glass, plastic, acrylic and metal. - stop doing sharp bends in the airflow path creating noise and slowing down airflow (im looking at you SL600M)

Additional Comments

i needed this case to fit into a 19" rack which it does, i am running a hyperV server which is working flawless now that i modded the case. for each fan i cut a giant circle out so nothing is blocking the airflow anymore, this not only reduced my case and cpu temps by over 16C Its a lot quieter now that the air flow isnt as turbulent or restricted. my Ryzen 5 3600 now idles at 24C instead of 32C, and when under synthetic load its now 47C instead of 63C (Hyper212 Evo CPU HSF) 4x 140mm and 2x 120mm Arctic Cooling F series pwm fans 2x 120GB SSDs and 1x 500GB NVMe M2 no part of the pc goes past 30C on average now that the cooling has been sorted.


Submitted on Wednesday, May 29, 2019
By Joe
From Strathmore

Strengths of the product

Small form factor, adjustable io position, enough room behind the board plenty of room for cables

Weaknesses of the product

Not easy for a powerful system cooling is a issue The holes behind the magnetic mesh. The magnetic mesh is a great idea in theory but could of used a better ridge around the mesh to hold it in place, With cheap cases break out card slots shouldn't be a thing anymore in my opinion

Additional Comments

Cheap, nice looking, but not for something that needs air flow.

Possibly best case on the market for single GPU builds

Submitted on Monday, February 04, 2019
By Anthony De Ve;lis
From Toronto

Strengths of the product

-small size -excellent cooling -supports 240 mm radiator or 157 mm tower cooler -good tolerances on the rear GPU mount, not much room for sag/play with large GPUs (I have a 1080 Ti) -sturdy frame -cable management is excellent for this size case, it just requires a little more patience. I routed the GPU power around the front 140 mm fans and under the back plate -removing and cleaning dust filters is trivially easy. Remove them during installation however or you will get static build up (magnet moving on metal induces an electric field) -plenty of locations for RGB strips. I am using three of the four angled edges of the acrylic side panel -comes with zip-ties and velcro strips and slots in the backplate to mount them on -room to mount a PWM fan controller and RGB controller at the rear of the backplate -SSDs can be mounted on the front or rear of the backplate -comes -movable IO panel. Front panel it optimal -the case is highly customizable

Weaknesses of the product

-no power supply shroud, however it is debatable whether this is a weakness for such a small case -PITA to route power cables under and on top of the backplate, but it can be done. only the 24 pin HAS to go through the middle cut out of the backplate -non-replaceable expansion slot covers -magnetic dust filters will stay perfectly still during normal use, but there is no bezel holding them in place -acrylic side panel; though this is not necessarily a negative, I transport my rig a lot and specifically wanted to avoid tempered glass -I would have gladly paid CAD$5-10 more for rubber grommets. This is nit picking, the cable management is better than good enough

Additional Comments

Overall I am thrilled with the value of the case. In my opinion it is the best of the three: Q300L vs NZXT H400 vs Corsair 240. The corsair has better cable management, the NZXT has better looks but the Q300L has the best cooling and a decent combination of the other two. The cable management is more than good enough and the cooling/airflow is better than most mid and full towers. (Comparing to my brothers Corsair 540, NZXT H500, and Phanteks -- I can't remember the model; but it's a full tower with a front mesh)). I overclocked a 9600k to 5.0 GHz @1.4 Vcore for 77* AA max temperature on Prime95 and 5.0 GHz @ 1.32 Vcore Prime95 at a respectable 85* AA max temperature (cooler is a 2-fan Phanteks tower style, 157 mm, the largest the case is specced for (but there is additional clearance if you don't place the front IO on the top edge). I've left it on 4.8 GHz @ 1.25 Vcore because MB voltage is not necessarily the same as the actual SOC voltage and I don't have a multimeter to measure it myself. Assembly was easy. With fans installed you'll have a little bit of difficulty getting a large GPU in there but I've got a 1080 Ti 320 mm in there with ample clearance for the front case fans. Cable management will be a slight PITA because there isn't a whole lot of room between the backplate and case faces but the only cable I couldn't get around the edge of the backplate was the 24 pin MB and the SATA power because the SATA power wasn't long enough to reach the SSDs AND HDD. With the cables management and all storage mounts occupied I was still able to fit a PWM fan controller and RGB lighting controller velcroed to the back of the SSD positions. Again, you will need some patience to manage the cables effectively but it can be done. You might also need a bandaid or two because I cut my self on the corner of the backplate when routing the two 8 pin GPU power cables around the front of the backplate, below the front case fans. you can switch the bottom and top by simply popping out the rubber feet and switching the dust filters around. It can also go on its side with rubber feet on the metal side cover, though I wouldn't use it as a monitor stand or in the flat configuration at all. 5/5
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