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Yes—at its reported $44.90 MSRP, the Cooler Master Q300L V3 is a strong value for a compact MicroATX build if you are comfortable adding front intake cooling when needed. It includes tempered glass, a fast front USB-C port and flexible fan and radiator mounts, but it comes with only one fan, and front cooling can reduce graphics-card clearance. Tom’s Hardware reported the MSRP in its August 24, 2026 review; check current listings for today’s price.
What the Q300L V3 is—and what it is not
The Q300L V3 is the Lite Version in Cooler Master’s QUBE product family. It is a compact case for Micro-ATX or Mini-ITX motherboards, with mesh and steel construction, a tempered-glass side panel, and black or white finishes. The black model identifier is Q300LV3-KGNN-S00; the white is Q300LV3-WGNN-S00. It is a distinct product from the older MasterBox Q300L and from the default QUBE 340.
Tom’s Hardware’s Joe Shields called it the Best Budget Micro ATX chassis on the publication’s Best Cases list. That is the reviewer’s editorial judgment, not a guarantee that it is the best fit for every build.
Is it a good value at the reported price?
Tom’s Hardware reported a $44.90 MSRP and described sub-$40 pricing at the time of publication. Those are review-period figures, not a live quote: retailer price snapshots differed when the review page was retrieved. Check the current price and availability before buying. The practical value also depends on whether you need to buy additional fans and whether the case fits your existing components.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
For the price, the combination of a glass side panel, repositionable I/O, 20 Gbps USB-C and broad mounting options is attractive. But the case is not a complete airflow setup out of the box: only one rear exhaust fan is included, with no front intake fan.
Will your parts fit?
The manufacturer lists external dimensions of 386.1 × 230 × 388.5 mm including protrusions (374 × 230 × 374 mm excluding them), and a volume of 34.5 L including protrusions (32.17 L excluding them). The case has four expansion slots. Tom’s Hardware’s specifications say cards up to 3.5 slots can be accommodated, but slot width alone does not establish clearance for a particular graphics card.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
| Component or feature | Published specification | Fit consideration |
|---|---|---|
| Motherboard | Mini-ITX or Micro-ATX | Back-connect motherboards are not supported, according to Tom’s Hardware’s specifications table. |
| CPU cooler | Up to 178 mm tall | Check the cooler’s full height against this limit. |
| Graphics card | Up to 366 mm without a front fan | A front fan or radiator uses space, so the published maximum is not a universal fit guarantee. |
| Power supply | ATX; up to 200 mm long without a bottom fan, or 140 mm with one installed | Allow for the reduced length limit if you plan to use a bottom fan. |
| Drive mounting | Tom’s Hardware lists one 3.5-inch drive or two 2.5-inch drives | Cooler Master’s QUBE family page separately lists one 3.5-inch position, one 3.5/2.5-inch combo position and two 2.5-inch positions (maximum four). Confirm the exact Q300L V3 manual if drive capacity is decisive. |
Graphics-card clearance deserves particular attention. In its test build, Tom’s Hardware found the Asus TUF RTX 4080 too long and used the shorter RTX 4080 Founders Edition instead. A front fan or radiator can further reduce the available length. Top-mounted fans or a radiator can also overhang the motherboard’s top edge and its VRM heatsink area.
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Cooler Master lists mounting for two 120 or 140 mm fans at the front and top, and one 120 or 140 mm fan at the bottom and rear. Radiator support is listed as 120 or 240 mm at the front and top, and 120 mm at the rear. The included fan is a 140 mm non-ARGB rear exhaust; there is no front intake fan.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
That arrangement is usable for a modest build, but the single included fan leaves less airflow capacity than a multi-fan configuration. If your CPU and GPU produce substantial heat, budget for additional case fans and check how a front fan or radiator changes GPU clearance. The available review does not establish a particular add-on fan as the best choice.
How did it perform in Tom’s Hardware’s tests?
Tom’s Hardware tested with an Intel Core Ultra 7 270K Plus, a Thermalright Peerless Assassin 120 SE and the included case fan plus an added Cooler Master MasterFan M120 when needed. The test stressed CPU and GPU together for 30 minutes, idled for 15 minutes, then tested with fans at 100%. The reviewer noted that the test motherboard limited power to around 210 W, and used an RTX 4080 Founders Edition because the Asus TUF RTX 4080 was too long.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
| Test condition reported by Tom’s Hardware (2026) | Reported result | How to interpret it |
|---|---|---|
| Noise-normalized configuration, two fans | About 87°C CPU and 74°C GPU averages | The reviewer said this system drew less power than other test systems; results are not directly comparable with those other systems. |
| Fans at maximum speed, stated test setup | 81°C CPU and 63°C GPU averages | These are measurements from the named test build and method, not expected temperatures for every PC. |
| Maximum fan speed, included fan plus added MasterFan M120 at one meter | About 55 dBA | The reviewer found the included 140 mm fan particularly audible at its 1,400 RPM maximum. |
The reviewer described noise-normalized performance at slower fan speeds as fine, while noting that more fan capacity could improve airflow. The temperature and noise figures should be treated as results from this particular test configuration, not as guarantees for a different processor, graphics card, power limit or fan curve.
The Tool Desk
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| Strengths | Trade-offs |
|---|---|
| Reported $44.90 MSRP; tempered-glass side; 20 Gbps USB-C; adjustable I/O placement; vertical or horizontal orientation; broad fan and radiator mounting; tall cooler and long-GPU support where the cooling layout permits; reviewer found it easy to build in. | One rear fan included and no front intake; maximum-speed fan noise; front cooling reduces GPU clearance; no separate PSU shroud; cable openings lack grommets; reviewer wanted Velcro tie-downs; magnetic top and front filters can shift slightly when touched. |
Who should buy it?
The Q300L V3 makes the most sense for a cost-conscious MicroATX or Mini-ITX builder who values the front USB-C port, glass panel and flexible placement, and who will verify component fit before ordering. It is less suitable for someone expecting multiple quiet fans in the box, a fully concealed PSU and cables, or guaranteed clearance for a long graphics card with front cooling installed.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Before choosing it, compare the complete cost of the case and any extra fans with alternatives you are considering. Check your graphics-card length against the planned front cooling, PSU length if using a bottom fan, drive needs, top radiator clearance, and the noise level you expect from your fan curve. The case has a two-year warranty; confirm coverage terms for your region with the seller or manufacturer.
Quick Recap
Sources and specifications
- Cooler Master: QUBE 340 / Q300L V3 official product page
- Joe Shields, Tom’s Hardware: Cooler Master Q300L v3 MicroATX case review, published August 24, 2026
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
