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❄️ Stay cool, stay sleek — the Q300L is airflow redefined.
The Cooler Master Q300L V1 is a compact yet versatile Micro-ATX PC case designed for professionals who demand high airflow and modularity. It supports Micro-ATX and Mini-ITX motherboards, accommodates large CPU coolers (up to 159mm) and GPUs (up to 360mm), and offers flexible I/O panel positioning. Its fully ventilated, perforated steel chassis with magnetic dust filters ensures optimal cooling and dust protection, while the transparent side panel showcases your build with pride. Ideal for mid-range gaming and office setups, it balances size, performance, and style with a competitive price point.




















| ASIN | B0785GRMPG |
| Antenna Location | Gaming |
| Best Sellers Rank | #2 in Computer Cases |
| Brand | Cooler Master |
| Built-In Media | 1 computer case |
| Case Type | Mini-Tower |
| Color | Dark Gray |
| Compatible Devices | Micro-ATX and Mini-ITX motherboards, Cooler Master devices |
| Cooling Method | Air |
| Customer Reviews | 4.5 out of 5 stars 14,004 Reviews |
| Enclosure Material | Alloy Steel, Plastic |
| 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 | 15.39"D x 9.06"W x 15"H |
| Item Type Name | grocery |
| Item Weight | 480 g |
| Manufacturer | Cooler Master |
| Material | Alloy Steel, Plastic |
| Mfr Part Number | MCB-Q300L-KANN-S00 |
| Model Name | Q300L |
| Model Number | MCB-Q300L-KANN-S00 |
| Motherboard Compatability | Micro-ATX and Mini-ITX |
| Number of Fans | 3 |
| Number of Items | 1 |
| Other Special Features of the Product | Accomodates CPU Coolers, Adjustable, Dust Filter, Edge-To-Edge Panel, Fully Ventilated |
| Power Supply Maximum Output | 500 watts |
| Power Supply Mounting Type | Bottom Mount |
| Recommended Uses For Product | Gaming |
| 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 |
| Warranty Description | 2 |
J**E
Great case for mid-range builds- add good fans, and don't overdo though.
Very good case for mid-range builds- don't ask too much from it though. Size is excellent for mATX, fits full ATX PSU. Respectable cable management. While the case technically can fit large, 3 fan vid cards, I advise sticking to smaller 2 fan GPU's to keep the insides clean and roomy for airflow. People complain about the airflow, but I have no trouble at all keeping my build running cool on air cooling alone, using 3 high static pressure intake fans combined with 3 high airflow exhaust fans (do not use the stock exhaust fan) and make sure the case is high positive pressure balanced. Ryzen 5500 on stock cooler, RX5700 gpu runs temps in the 60's under medium 1080p gaming loads. Very good price. Just don't try to build a super-computer in this case, and it works great.
A**R
Great purchase!!!
Great quality, great layout for cable management, excellent design, comes with all the hardware and tools you'll need except a basic screwdriver. I was able to fit everything I wanted in there despite the smaller size and it looks great! Great airflow, everything comes apart for easy install, and the 3 mesh panels keep cat hair out. 10/10 a must-buy.
I**L
Pretty Good
I was looking for a small mATX case to use with some older parts that I had in storage (I will list all the parts at the end for reference). So far it's worked great and I didn't really run into any major issues. I like how compact the case is and I was able to fit it under a small table. The computer is for light gaming and web browsing, so thermals have not been bad. Putting all the components together in the case was pretty straight forward. I found it a lot easier to work with than a small ITX or even a full ATX build. I didn't install any fancy or exotic parts (AIO/Water Cooling) and kept it simple, which I feel helped a lot. I like the dust filters that come with the case and the design on the filters give it a nice look. Since I am using a simple CPU (9400F), fan noise is non-existent since the processor doesn't generate a lot of heat. I'm using some Corsair RGB fans (x2 in front panel/x2 top of case), which look great and have them configured to silent in iCUE. There are a few issues so far with the case: 1) Stock outtake fan stops spinning randomly. I have it connected to the motherboard and have set the fan to full speed, but it does not fix the issue. I've also tried other fan headers on the board, but the fan continues to stop spinning. Not a big deal since a basic case fan is inexpensive, so I will be replacing it. 2) The Plexiglass can scratch easily if your not careful. I debated taking off the plastic film for this reason, but decided to remove it in the end. Glass would have been better, but for the price, you really can't complain. 3) Expansion slot covers are attached to the case, so removing them can be a little tricky. I ended up bending one of the slots a little bit, but was able to fix it by bending it back into place carefully. Finally, the only other thing that would have been nice is to have an all-in-one front panel connector. This would definitely help inexperienced builders to easily connect the front panel ports/power to the board without much struggle. Overall I'm happy with the case and do recommend it for anyone looking for an inexpensive mATX build that will look great. PC Specs: AsRock B365M Pro 4 Motherboard i5 9400F 8GB TeamGroup RAM 2133Mhz (two modules) RX 570 4GB TeamGroup SSD EVGA 650W Power Supply ATX (non-modular) ID Cooling Low-Profile CPU Fan (IS-47-XT) x4 Corsair SP120 RGB Fans with Commander Core
F**A
Amazing Case For an Amazing Price! (Model: Q300L)
So first I'd like to state that this review is specifically for the Q300L model. Amazon does this annoying thing where they mix all the reviews of all the models together and I can't stand it so I'm just stating the model flat out. I just built my 10 year old nephew’s PC using this case and I have to say that I was very surprised at how much I loved building in this case. Originally I bought the Compucase HEC HX300 case for 30$ from Newegg and I was just frustrated at the lack of air flow from that case. It only had room for one fan which was the back exhaust and that's it. It didn't even have holes for the power supply's intake fan! It was my fault for not researching enough and buying something so cheap. Then I did a little research and came across this case. It is only 50$ but has everything I want. I've seen PC builders on youtube build with this case and they all had great things to say. So the first thing I like about this case is obviously how much airflow it allows. It's an interesting design because there are holes all over the top, all over the bottom, and all over the front and you can install 4 fans if you wanted to (2 up top, 2 in front, 2 in bottom) in addition to the included exhaust fan at the back making it support up to 5 fans! Now with all those holes you might be thinking this is going to be an ugly case but as you'll see in the pictures this is not the case (pun intended) and it has very sleek looking dust filters to cover the top, front, and it’s not obvious from the picture but it has a filter on the bottom as well. I was pleasantly surprised to see that the filter is magnetic which made removing them to install my fans a breeze (pun intended). I also imagine cleaning them when they get dirty will also be very simple. You can simple remove them and just rinse with water. One tip when installing fans is that since there’s air holes all over, they actually made a very small indentation around the holes that you should screw in your fans. These “guides” are hard to notice but if you look closely you’ll see them. They have space for 140mm and 120mm fans depending on whatever you want. Air is able to easily flow through the filter so my air flow issues were resolved! The case also looks very nice in my opinion. I have the black model just because that’s what my nephew wanted but in review videos I’ve seen, the white one looks very nice as well. Cable management at the back is pretty good too and the case comes with a lot of zip ties. The filters I mention above are also very aesthetically pleasing. The power button, 2 USB ports, headphone jack, and speaker jack are on the side which I don’t mind. The interesting thing is that this IO panel can be unscrewed and moved to the other side which is nice. The clear side panel is acrylic but it’s a 50$ case so it’s fine. It doesn’t look bad at all. There’s also room in the cable management area for a 3.5” hard drive and 2 SSD’s inside the main area which is very good. Overall the case was pretty simple to build in. It’s designed very well to maximize airflow while looking great. I think this is an excellent case especially for the price. If you’re in the market for a cheap but good PC case, then you my friends have stumbled on a cheap but GREAT PC case. I would highly recommend this case and am willing to do even more expensive builds with this case in the future. One final note I’ll add, I built my nephew’s pc with a Ryzen 5 1600 processor and RX 480 gpu reference model targeting 1080p gaming and the heat in my old case with that one exhaust fan was reaching around 87 degrees C. After I added two intake fans in the front and one exhaust fan in the top along with the back exhaust fan that comes with this case my temperatures went down into the mid 70’s while gaming which is great. If you want looks as well as functionality for a great price, go with this case.
J**.
Excellent budget case. No frills.
Super budget case for a super budget build. Happy with the case. It's not the most solid thing in the world but it holds the guts of the PC just fine.
B**M
This is THE best case below $40
When I was picking my parts, I wanted to spend as little as possible on a case without going into the ultra budget rosewills and what not. Pretty much every case I was interested in was either in the $60 range or the $100+ range. I was going to settle on the thermaltake v21 and replace all the sides with windows, then I was going to settle on the fancy version of the q300l. I kept researching and researching and it sounds like cooler master fans aren't that great so getting two rgb ones with the fancy version sounded like a good deal but I had found plenty of cheap 6 packs of rgb fans and would prefer if all matched. This case at below $40 was just simply the most unique one at this price range and I had already decided on all the other parts (don't pick the case first) and tried imagining the build. I changed my mind on getting ring style fans, the perforated nature of this case would completely ruin the rings' lighting thru the walls, so the other option was fully lighted fans. Definitely the right choice in this one. You need to be careful with CPU coolers too, several popular ones are too tall by less than a mm. Just happens that the fans I got, uphere's (I took a chance and they are so good, don't let the brand scare you) also come on uphere's cooler and it fits PERFECT. No touching the side panel or anything. I didn't realize how black the case was as well and that is such a good thing. It is black, not grey. Cable management was as easy as can be with zip ties and fabric ties. Plenty of space to feed any cable heads thru any open route, I never got frustrated or had a problem making it look how I wanted. There's mixed info on the cooling performance. Lots of holes=lots of air. Gamers Nexus proved that false but I have yet to see temps over 75c during all benchmarks. Probably due to 9 fans. It just looks clean. I don't know if you can tell from the pictures. Cons: it's a cheap case so it's got more of a bare bones metal look than a sleek spaceship look. Not necessarily a bad thing. I really can't think of anything else, it was a complete joy to build in and everyone who's seen it really appreciates it. Would definitely recommend for budget builds and high end ones and is a perfect choice for custom builds built in quantity for offices and such at such a cheap price. Don't hesitate, if you think this case looks good even a little bit, it looks better in person and you shouldn't be disappointed. Make sure you are using micro atx motherboard. Just saying. Some people. Normal atx psu fits with a recessed bracket, thought it was weird but now I actually like it. It allows the power cable to bend at the edge of the case as opposed to sticking out and inch or so. Definitely a buy for those on a budget.
Y**A
Good except for the poor design for pci port cover
Overall great! Major and unforgivable problem: the covers for PCI cards are soldered on the case and very hard to remove especially if the motherboard is already installed. I have to almost break the case to detach it to install a PCI network card
S**H
Incredible Airflow & Smart Design – Best Budget mATX Case!
This case punches way above its price point. The airflow design is excellent, and the magnetic dust filters are incredibly convenient to remove and clean. I really like the modular I/O panel—you can reposition it depending on how your setup is oriented, which is something you don’t usually see at this price. The compact size is perfect for a clean Micro-ATX build without feeling cramped. Lighting can easily be added with fans. The case feels very durable for the price while still remaining light weight. The case has a decent bit of mounting accessibility, allowing for larger components despite the small size, always make sure to check PcPartPicker before pulling the trigger tho as not all components will be compatible. Cable management takes a little effort due to the size, but that’s expected with compact cases. Overall, fantastic value and very thoughtfully designed. A truly incredible deal!
L**E
bon boitier basique
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
Good Case with many options
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
Cheap, compact but carefully crafted for the air access from all sides
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
Echte aanrader
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
Gabinete ótimo, mas acrílico super fácil de arranhar.
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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