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🖤 Master your space, flaunt your build.
The Cooler Master MasterBox Q300L is a versatile Micro-ATX mini-tower case featuring a fully adjustable I/O panel, edge-to-edge transparent acrylic side panel, and a magnetic dust filter system for superior airflow. Designed for compact builds without sacrificing performance, it supports large GPUs up to 360mm, CPU coolers up to 159mm, and offers flexible cable management options. Ideal for professionals and gamers seeking a sleek, customizable, and efficient PC case.












| ASIN | B0785GRMPG |
| Antenna Location | Gaming, General Computing |
| Best Sellers Rank | #31,478 in Computers ( See Top 100 in Computers ) #155 in Computer Cases |
| Brand | Cooler Master |
| Built-In Media | 1 computer case |
| Case Type | Mini-Tower |
| Color | Black |
| Compatible Devices | Micro-ATX and Mini-ITX motherboards, Cooler Master devices |
| Cooling Method | Fan |
| Customer Reviews | 4.5 4.5 out of 5 stars (13,549) |
| Enclosure Material | Alloy Steel Plastic |
| Fan Size | 120 Millimeters |
| Global Trade Identification Number | 00884102038006, 00884102095313, 04719512065488 |
| Hard Disk Form Factor | 3.5 Inches |
| Internal Bays Quantity | 1 |
| Item Dimensions D x W x H | 39.1D x 23W x 38.1H centimeters |
| Item Type Name | grocery |
| Item Weight | 480 Grams |
| Manufacturer | Cooler Master |
| Mfr Part Number | MCB-Q300L-KANN-S00 |
| Model Name | Q300L |
| Model Number | MCB-Q300L-KANN-S00 |
| Number of Fans | 3 |
| Other Special Features of the Product | Magnetic Dust Filters |
| Power Supply Maximum Output | 500 Watts |
| Power Supply Mounting Type | Bottom Mount |
| Supported Motherboard | Micro-ATX and Mini-ITX |
| Total Expansion Slots Quantity | 4 |
| Total USB 3.0 Ports | 2 |
| Total Usb Ports | 2 |
| UPC | 884102095313 884102038006 |
E**O
Micro Case with ATX Mobo
Best casing I ever bought. Small and light. My gigabyte 1080 fit this inside and still more space inside.
S**A
Deserve 1 star
At least they answered me well, but the product was not I expected
I**A
Good product for best price
What a nice casing and gave a good image for my old pc
L**E
Attention aucune baie extérieure pour lecteur graveur ou accessoire lecteur de cartes intégré. Place pour un seul hdd 3.5 et pour 2 ssd 2.5. Possibilités d'usage en vertical ou horizontal avec tableau de bord déplaçable sur les 4 côtés. Filtres anti poussière aimantés.
P**L
So this q300l case was released by cooler master in 2018 This Case was q500l 2019-2020 predecessor This case has holes in top, front and bottom I had 5 fan laptop cooler on which this Case is sitting right now, my laptop had fan issues so now it's used for PC case cooling I have attached 2 arctic fans 140mm 1600rpm and 120mm ,1200rpm in front for intake 2 coolermaster fans one for exhaust (xtraflow 1500rpm) backcand one for top ( 200-1000 rpm) 1 circle fan (1000-1200) rpm My PC temp with just one exhaust fan was around 45-55 during normal usage and CPU temp was around 64-74 degrees on normal to heavy load and gpu temps were 50 - 60 degrees CPU fan was spinning at 1500 rpm max After bumping up AMD wraith Cooler fan to max fan speed of 2600 rpm in bios settings, my CPU temps went down to 50 degrees. After installing all the fans, My case temps are 36-39 degrees My CPU temp is at 42 degrees normal and at 57 on load. If your buying this case get at least 2-4 fans You can 140mm fans or radiator in the front only On top only 120mm can be attached properly I could be wrong depends on brand and size of 140mm fan My arctic fan screw holes weren't able to match on top of the case. The magnetic dust filter on top and front can be cleaned easily. The side panel is acrylic, fingerprint magnet. 2 USB 3.0 jacks in front Mic and headphones Jack with HD audio but can only do 5.1 channel not 7.1. I had to attach my 7.1 channel headphone in the back Cable management very good Lot of spaces in the back. If you have radiator then your CPU temps will get better than mine . This case should cost around 3500 rupees But I had no choice but pay up 4500 rupees Cuz it I needed it urgently. This pandemic has really screwed PC enthusiast when it comes to pricing of PC components. 4/5 My PC specs AMD 1300X 3.8ghz (2018) Sapphire pulse RX580 8gb OC lite (2020) 😑 Ballistix red 16gb (2020)😑 Cooler master 550 mwe psu (2018) Acer vgo monitor 144hz LG monitor 75hz
K**E
1) Cable management that does not suck, that's a big advantage 2) Can be placed under the monitor on the desktop, rubber pieces on the long side 3) With 3 PWM-driven chassis coolers it is a silent beauty 4) Overclocked graphics card temperature is below 65°, that's very nice airflow 5) The side panel is acrylic, not glass, which is so so, but pretty fine for a budget setup 6) Buttons and USBs can be rebased at any side, but I just kept them as-is 7) Very careful and lovely use manual, showing all necessary addons for different setups 8) Loved the included rubber pieces for easy placing of the SSDs Would definitely recommend it!
D**L
Goede kast met aardig wat mogelijkheden! Had zelf een kast nodig die niet te veel ruimte innam en niet al te duur was. Ik ben positief verrast.
D**A
O gabinete é ótimo e super bonito, o que mais me chamou atenção dele foi o design super compacto e a versatilidade de usar, mas apenas de ser bonito, ele tem os seus defeitos. O acrílico é super fácil de arranhar, enquanto eu estava mudando as peças do meu antigo gabinete para esse, eu deixei o acrílico encima da minha cama com todo o cuidado do mundo, porém, quando eu fui fechar o gabinete com o acrílico, eu vi um pequeno arranhão no canto inferior direito, de início eu não dei muita importância, mas com o reflexo da lâmpada do meu quarto eu achei vários e vários pequenos arranhões que só podem ser vistos na luz, eu simplesmente não entendi o que causou aquilo, já que eu tive o máximo de cuidado possível, mas para quem vai comprar esse gabinete, cuidem do acrílico! E de resto ele me agradou muito, acho incrível como a Cooler Master consegue fazer excelentes gabinetes com preços incríveis. Apesar de ser um gabinete M-ATX, tem como você colocar até 6 fans de 120mm nele que eu achei super top e bacana. Recomendo d+.
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1 week ago
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