

🖤 Build Bold, Stay Cool, and Stand Out.
The Cooler Master MasterBox Q300L is a versatile Micro-ATX tower designed for professionals who demand customizable layouts and efficient cooling. Featuring a magnetic dust filter, fully ventilated chassis, and a transparent acrylic side panel, it supports a range of components including long GPUs and tall CPU coolers. Its modular I/O panel and compact footprint make it perfect for stylish, space-conscious builds without compromising performance.












| ASIN | B0785GRMPG |
| Are Batteries Included | No |
| Best Sellers Rank | #36,718 in Computers ( See Top 100 in Computers ) #240 in Computer Cases |
| Brand | Cooler Master |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (16,478) |
| Date First Available | 5 December 2017 |
| Form Factor | microATX |
| Item Weight | 480 g |
| Item model number | MCB-Q300L-KANN-S00 |
| Manufacturer | Cooler Master |
| Number of USB 3.0 Ports | 2 |
| Product Dimensions | 39.08 x 23 x 38.1 cm; 480 g |
| Series | Q300L |
| Wireless Type | 802.11a |
J**.
Best for compact purposes. will fit big luggage for check-in.
While nothing is really perfect, this modular case lets you style give you a lot of options for your PC. Small form factor case for your mATX (perfect fit) and ATX (pushing it a bit but still okay). Can accommodate long GPUs. You have the liberty to fix CPU components (PSU, Fans, I/O Panel) as you like. Cooling is a bit tricky but should be fine after a few arranging of parts which i totally love about it. I enjoyed arranging components to get where i wanted. Plenty of wire routing options which are stealthy for a cleaner install. While cooling takes a bit effort compared to mid-tower/full towers, Im sure this will accommodate more cooling parts and be way cooler than your regular small form factor ITX cases. will buy another one for a future project if needed.
F**O
Compact
Smallest case I could find that fits a full ATX motherboard. Had to add fans to get proper airflow. Otherwise perfect for such a small case.
A**D
average quality
good small size and good price average quality
M**5
الصندوقQ500l شكله جميل واماكن تركيب الكابلات فيه جيدة لقد قمت بتركيب لوحة ام من نوع micro ATX ولم اواجه اي مشكلات في التركيب و المروحة الخلفية صوتها منخفض وجودتها ممتازة ، ولاكن مكان وضع مزود الطاقة موجه الى الواجهة الامامية للصندوق فسوف تسمع صوت مروحة الباور سبلاي فقط اذا كان صوتها عالً اما اذا كان منخفض فلابئس بذلك، انصح بشرائه بهذه السعر.
W**S
Best compact atx case
Best compact full atx case. Need tweaking for better airflow.
A**A
Quality
Solid product for the price, happy to buy
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.
M**K
Not the best case, mediocre build quality
The case is not that good Build quality is mediocre, with plastic every where The case was a bit difficult to build in due to space Air flow was bad, immediate temperature rise, even I was surprised, and this utilizing as much fans as possible Manual was basic but it covered important information Bottom filter is attached with 4 pins/lock and is easily bendable I do not recommend this product
A**X
Muy contento con la compra ya que tiene una apariencia mas elegante y minimalista. El vendedor aun siendo externo a amazon fue super rápido, aunque el producto me llego 3 días mas tardes de lo esperado por fallo logístico del repartido ( el producto llego en el tiempo estimado que marco el vendedor, el no tuvo la culpa).
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!
J**R
構成は、 ・CPU i5 9400F ・メモリ CORSAIR DDR4 ・MB ASRock B365M Phantom Gaming 4 ・グラボ GALAKURO RTX2060S ・電源 オウルテック 750W ・3.5HDD×1 2.5SSD×2 ケースは大きく見えますがけっこう軽く扱いやすいです。 四か所に取っ手がついているので組んでいる時の取り回しはかなり楽でした。 ケース全体はメッシュ構造で前面と上部にアクリルのカバーがついていて、そのカバーの端に通気口がついています。通気口自体が小さかったのでエアフローが心配でしたがベンチマークソフトを起動させてもそこまでケース内が熱くなることはなかったです。 裏配線スペースも28mmあるのでプラグイン式でないATX電源であっても十分配線スペースを確保できます(ただ3.5HDD×1、2.5SSD×2の設置場所が裏配線スペースも兼ねているので3カ所つけるとあまり余裕はないですが何とかいけました)。 グラボは360mmまでいけるのでRTX2060Sを入れてもまだ余裕があります。ただ初期位置のIOパネルがちょうどグラボの真上で入れるときに干渉するのでグラボを斜めにずらす等、入れ方の工夫が必要です。 PCIスロットは付け外し可能なネジ式ではなく引きちぎり式なのでそこが少し残念でした。 付属のファンはフロントに2つ、リアに1つです。重いゲームをするのでフロント2に対してリアファンが少し心もとなかったのでENERMAXのファンと交換して上部に1つ排気用として設置しました。その後、FF15ベンチ(FHD、2K、4K高品質)を何度か試しましたが室温22℃に対してCPUはリーテルファン使用で平均65℃前後でした。発熱が高いアプリや重いゲームをする場合は個人的に上部に排気ファンを1つ追加することをおすすめします。 あと、前面、上部、側面がアクリルパネルにほこりや動物の毛は吸着しやすく指紋も付きやすいです。
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.
Trustpilot
2 months ago
2 weeks ago