I went hands-on with this portable and compact gaming PC case — and now I’m planning my first mini ITX build

Desktop gaming PCs have a reputation for being huge, and, to be honest, a lot of them are. However, if you’re confident enough to dive into the twisted world of cable management, then a compact build could be a fantastic challenge that pays off as a space-saving monster rig. When the Cooler Master Qube 340 case appeared at Computex earlier this year, I was immediately intrigued, even if I can’t afford the full gamut of parts to build inside of it just yet.

Cooler Master provided a sample but did not see the contents of my article before publishing. I’m also refraining from assigning a traditional review score to this case until I can complete a build with a full set of components.

How much does the Qube 340 cost?

For now, the best place to buy the Cooler Master Qube 340 is Newegg at $54.99. It’s currently listed by Newegg itself, rather than any third-party sellers, and is in stock at the time of writing. A listing for the Qube 340 in black on Amazon US lists “Newegg Business” as a reseller at $59.49, which isn’t worth the extra money. At the time of writing, the white variant of this case is “currently unavailable” on Amazon and is outright missing from Newegg.

What I like about the Qube 340

Ever since the RAM crisis ruined any prospect of affording Valve’s Steam Machine gaming PC, I’ve thought about how I could repurpose some of the spare components I have in storage — and even then, it isn’t a huge pile. Still, I knew I’d never manage anything quite as purposefully tiny, but I could come close with a mini ITX build, and the Qube 340 looked perfect on paper.

It came in a huge box, but it feels as compact in person as I’d hoped. The removable handles are also ideal for what I’ve planned: A desktop that I can set up and take away at a moment’s notice, rather than leaving something permanently underneath our TV. Sure, I’ll need to buy some more niche parts, like a compatible motherboard, but Cooler Master impressed me out of the box.

My most important consideration was whether the ASRock Challenger Radeon RX 9070 XT graphics card I have would fit, depending on my front-fan decisions. I could also use an AIO radiator, but the cheesegrater-esque design of the Qube 340 feels better suited to a traditional air cooler — even if only in aesthetics — plus there’s a 140mm ‘DF1402512RFLN’ fan pre-installed at the rear.

At a glance, there’s nothing to worry about, as the 290mm GPU fits with around 78mm to spare. My immediate idea is to have a single 140mm intake fan mounted at the top, pulling cool air into the case and pushing it through a CPU air cooler before exhausting it out the back. Still, I have options, including adding an even longer card, as long as everything is measured correctly.

Next up are cable management and routing options. Like most hobbyists, I prefer to take my time with my own builds and get everything as clean as possible, which is more of a mandatory requirement in a compact case than a preference. While there aren’t any dedicated trunking channels, there are a few mounting points for zip ties, so I just need to plan everything carefully.

The front-mounted I/O plate is also removable, so I can move it to the top of the case for easier access and re-route the attached cables from the start. It all depends on my motherboard of choice and how it determines the shortest route for each component, but it’s fantastic to have the option. I’ll always prefer my power button and front ports to be at the top of the case.

What I don’t like about the Qube 340

The build quality is generally great on the outside, with those sturdy carry handles and rubberized feet keeping it steady in a vertical position and similarly when laid flat for construction and upgrades. However, the metal on the inside — particularly around the motherboard tray — is quite thin with some flex, but I doubt I’d ever accidentally bend it in any permanent way.

I found the removable 2.5/3.5-inch drive tray similarly skinny and flexible, but it hardly has to do anything beyond holding my storage in place, and it at least removes with a single thumbscrew. It would likely take a heavy dent from an accidental drop to twist this case out of shape, and though it’s well padded in its box, it’s still worth checking everything over as soon as you buy one.

Concerns about missing rubber grommets are tempered by the fact that this is a $55 PC case. Not to excuse any internal mishaps that might happen, but again, it feels unlikely given how solid the outer shell is overall. Otherwise, being mostly toolless also raises some concern about the glass side panel, which holds well but is secured only by a single protruding tab.

Should you buy the Qube 340?

You should buy this if …

✅ You want to build a portable mini ITX gaming PC

✅ You’re prioritizing airflow with dust protection

You should not buy this if …

❌ This is your first-ever rig; compact builds are tricky

You can go smaller, but for my first planned adventure into a mini-ITX build, the Qube 340 is exactly what I wanted it to be. If, like me, you’re toying with the idea of a compact gaming PC that’s easier to move around than a full-sized desktop, I think you’ll be quite happy with this incredibly affordable case. Some of my opinions might change once I have enough parts to build inside it, but that won’t affect the overall praise I have for Cooler Master on this occasion.