Cooler Master MasterBox Q300L Micro-ATX Computer Case Gray for Office and Home Usage
MasterBox Q300L (MCB-Q300L-KANN-S00)
Hero image 0 of MasterBox Q300L (MCB-Q300L-KANN-S00), 0 of 19
Cooler Master

MasterBox Q300L (MCB-Q300L-KANN-S00)

|21 ratings

Key item features

  • Compact Versatility: The MasterBox Q300L is a small-sized chassis from the MasterBox Q-series, designed for functionality and modularity without compromising thermal performance.
  • ATX Power Support: Despite its compact size, this case uniquely supports a standard ATX power supply unit, a feature not commonly found in similar-sized products.
  • Adjustable I/O: The I/O panel offers six different placement options, with three choices on each side of the case, allowing users to customize the setup to best suit their system.
  • Distinctive Aesthetics: Its cube design and special pattern on the magnetic dust filter give the chassis a unique and standout appearance.
  • Practical Application: The combination of a practical design and customizable outlook makes the MasterBox Q300L an ideal choice for both office and home environments.
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Specs

Computer case type, Mid TowerWeight, 23 lbCompatible fan sizes, 119.89 mmFeatures, Acrylic PanelBrand, Cooler MasterColor, Gray

About this item

Product details

The MasterBox Q300L is your straightforward option in the lineup of the brand new MasterBox Q-series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldn’t tell, the MasterBox Q300L supports a standard ATX PSU which we don’t see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best. Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the MasterBox Q300L the perfect choice for office and home usage.
MasterBox Q300L (MCB-Q300L-KANN-S00)
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Specifications

Computer case type

Mid Tower

Weight

23 lb

Compatible fan sizes

119.89 mm

Features

Acrylic Panel

Warranty

Warranty information

Limited Warranty period (parts): 730 days Limited Warranty period (labor): 730 days

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

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Customer ratings & reviews

4.3 out of 5 stars
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21 ratings11 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars71% (15)
  2. 4 stars10% (2)
  3. 3 stars5% (1)
  4. 2 stars10% (2)
  5. 1 star5% (1)
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Showing 1-3 of 11 reviews

Jan 4, 2026
Reviewer name: Kevin
Sold and shipped byNewegg Inc.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Cooler Master Q300L

It's lowkey very good for budget wise especially if you tryna just build a budget or a secondary streaming pc most definitely I the filters are a cool design I recommend the q300 v2

Helpful?7FEE657LVFB6541482386
Mar 14, 2025
Reviewer name: WinnerWinner
Sold and shipped byNewegg Inc.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

would recommend

fantastic for the price althought i had a chesp prebuilt computer that id been slowly upgrading it is still impressive to me that swapping everything to this case gave me a 20 degree drop in cpu temps

Helpful?7FEE657LVFB6541482386
Dec 12, 2024
Reviewer name: David
Sold and shipped byNewegg Inc.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Good case

Perfect little case, remove dust filters for better temps.

Incentivized Review
Helpful?7FEE657LVFB6541482386
Current price is Now $39.99
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was $69.99
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