Lian Li O11 Dynamic Mini PC Case Review UK (2026), Build Tested

Right, let me be straight with you. The mid-range case market is a bit of a minefield. You've got cases that look stunning on a shelf but turn into a sweaty, cable-tangled nightmare the moment you actually try to build in them. And then you've got the opposite problem: cases with decent airflow but panels that flex like cardboard and edges sharp enough to draw blood. I've cut my knuckles on more than a few "budget-friendly" chassis over the years, and I've got the scars to prove it. So when something lands in the mid-range bracket and claims to offer the full package, I want to know exactly where the compromises are hiding.

The Lian Li O11 Dynamic Mini is a case I've been genuinely curious about for a while. The full-size O11 Dynamic has been a staple recommendation in the enthusiast community for years, and for good reason. But the Mini version is a different proposition entirely. It's aimed at builders who want that same dual-chamber design philosophy in a smaller footprint, which sounds brilliant in theory. Whether it actually works in practice is what I spent several weeks finding out, building two separate systems inside it and living with the results.

This is my full Lian Li O11 Dynamic Mini PC Case Review UK (2026), Build Tested, and I'm going to walk you through every aspect of this case the way I'd explain it to a mate who's about to spend their money on it. No fluff, no marketing speak. Just what it's actually like to build in, live with, and push thermally.

The case supports Mini-ITX and Micro-ATX motherboards, which immediately tells you something about the target audience. This isn't a case for someone building a workstation with eight drives and a full ATX board. It's for compact enthusiast builds, small form factor gaming rigs, and anyone who wants a clean desk presence without going full ITX-only territory. The external dimensions come in at roughly 285mm wide, 293mm tall, and 374mm deep, which is genuinely compact for what it offers internally. It weighs around 5.6kg without any hardware, which feels solid without being ridiculous to move around.

Fan support is where things get interesting. You've got mounts for up to three 120mm or two 140mm fans on the bottom, three 120mm on the side panel, and one 120mm at the rear. That's a lot of potential airflow for a case this size. Radiator support follows suit, with 360mm compatibility on the bottom and side, and 120mm at the rear. The case ships without any included fans, which is worth knowing before you budget. Here's the full spec breakdown:

The 374mm depth is the dimension that catches people out. It's deeper than it looks in photos, and you need to account for that on a desk with limited front-to-back space. Width at 285mm is genuinely compact though, and that's the dimension that matters most for desk real estate in most setups. The 293mm height is modest enough that it'll sit comfortably under a monitor without blocking your view, which is something I always check because I've seen people buy cases that end up acting as a wall between them and their screen.

One thing I want to flag early: the dual-chamber design does add to the overall footprint compared to a single-chamber case of similar internal volume. You're essentially paying a size premium for the cleaner cable management and thermal separation that the dual-chamber layout provides. Whether that trade-off is worth it depends entirely on your priorities. For a build where you want the internals to look clean through that glass panel, it absolutely is. For someone who just wants the smallest possible box, there are more compact options at this price point.

For Mini-ITX builds, the case feels slightly oversized, but that's not necessarily a bad thing. You get more room for cable management, more fan mounting options, and generally a less stressful build experience than you'd get in a dedicated ITX case. I've built in cases like the Lian Li O11 Air Mini and similar compact chassis, and the extra breathing room in the Dynamic Mini makes a real difference when you're trying to route cables without everything looking like a bird's nest.

The motherboard tray itself is solid. No flex when you're pressing in RAM or seating the CPU cooler, which sounds like a basic requirement but you'd be surprised how many cases in this price range have trays that wobble. The cutout behind the CPU socket is a good size, giving you easy access for backplate installation without removing the motherboard. That's a detail I genuinely appreciate because I've spent too many frustrated evenings trying to fish a backplate into position through a too-small cutout. Lian Li got this right.

During testing, I ran an RTX 4070 Super (around 305mm) and it slotted in with room to spare. The GPU sits in the main chamber with the tempered glass panel right next to it, which gives you a great view of the card but also means you want to think about airflow direction. The side panel glass is essentially flush with the GPU, so there's no intake from that side. Your cooling strategy needs to account for this, and I'll go into more detail in the airflow section.

There's no native vertical GPU mount option in the standard configuration, which is a shame given how popular riser cables have become for showcase builds. You can potentially adapt one in, but it's not a supported out-of-the-box feature. For a case at this price point and with this design aesthetic, I'd have liked to see at least an optional vertical mount bracket in the box. The O11 Dynamic XL supports this, so it's not like Lian Li doesn't know how to do it. Worth noting if a vertical GPU display is important to your build.

The practical implication is that most people building in the O11 Dynamic Mini are going to be running an AIO liquid cooler, and the case supports this well. A 240mm or 360mm AIO can go on the bottom, a 240mm or 360mm on the side, and a 120mm at the rear. The bottom mount is the most popular choice for intake, pulling cool air up through the radiator and into the case. I ran a 240mm AIO on the bottom during testing and the installation was straightforward, though routing the pump head cables back to the motherboard required a bit of patience.

One thing to watch with bottom-mounted radiators: the case sits on rubber feet that give you about 15mm of clearance from the desk surface. That's enough for airflow, but if you're on carpet, you'll want to think about whether you're restricting that intake. I tested on a hard desk surface and temperatures were good, but carpet users might want to consider a small riser or ensure the case is on a hard mat. It's the kind of thing that doesn't come up in spec sheets but matters in real-world use.

The 2.5-inch bays are distributed around the case, with some behind the motherboard tray and some accessible from the main chamber. Tool-less mounting is available for the 2.5-inch drives, using a simple slide-and-click mechanism that works reliably. I've used tool-less drive mounts that feel like they're going to drop your drive the moment you tilt the case, but these feel secure. The 3.5-inch bays use traditional screw mounting, which is fine. You're not swapping HDDs in and out regularly enough for tool-less to matter much there.

For a modern build, the storage situation is perfectly adequate. Most people are running one or two NVMe SSDs on the motherboard and maybe a 2.5-inch SATA SSD for secondary storage. The O11 Dynamic Mini handles that configuration without any issues. Where it starts to feel limited is if you're trying to run a media server or content creation rig with four or more large drives, but honestly, that's not the target use case for this chassis. If you need a drive farm, you need a different case entirely.

Rear panel clearance, meaning the space between the back of the motherboard tray and the right-side panel, is around 20-25mm depending on where you measure. That's enough for most cable bundles, but if you're running a lot of fan cables, RGB headers, and a chunky 24-pin ATX cable, it can get tight. I had to do a bit of creative bundling on my second test build, which had more peripherals connected than the first. Velcro straps are included, and they're actually decent quality rather than the flimsy ones you sometimes get.

The PSU shroud situation is a bit different here compared to a traditional mid-tower. Because the PSU lives in the secondary chamber, you don't have the usual shroud covering the bottom of the main chamber. This gives you a cleaner look in the main chamber but means your cable routing discipline needs to be on point. Sloppy cable management in the secondary chamber will show if you open the right-side panel, but since that's a solid steel panel rather than glass, most people won't care. The 24-pin ATX cable routing is the trickiest part of the build, and I'd recommend a right-angle 24-pin adapter if you want a really clean result.

The intended airflow path is bottom-to-top or bottom-and-side-to-rear, depending on your fan configuration. With a 360mm radiator on the bottom pulling air in and fans exhausting at the rear and potentially through the side panel (which can be configured as intake or exhaust depending on your setup), you can get good thermal performance. During my testing with a Ryzen 7 7700X and RTX 4070 Super, CPU temperatures under sustained load sat around 72-75 degrees Celsius with a 240mm AIO on the bottom, which is perfectly acceptable.

GPU temperatures are where you need to pay attention. Because the glass panel is right next to the GPU with no intake, the card is relying on the general airflow within the main chamber. My RTX 4070 Super hit around 78-80 degrees under sustained gaming load, which is within spec but warmer than I'd see in a mesh-front case with direct GPU intake. If you're running a power-hungry GPU and you care about temperatures, you'll want to maximise your bottom intake fans and make sure your exhaust is keeping up. The case can do it, but it requires a more deliberate fan setup than just chucking three fans in and calling it done. Lian Li's own product page shows the recommended fan configurations, and I'd suggest following those guidelines closely.

The placement on the top panel is genuinely convenient for a desk build. Plugging in headphones or a USB drive doesn't require reaching around to the front of the case or bending down to floor level. It's one of those quality-of-life details that you don't think about until you've used a case where the I/O is in a terrible position. I've reviewed cases where the front I/O is on the very bottom edge of the front panel, which is essentially useless unless your case is at eye level. Top-mounted I/O is the right call here.

The absence of a USB 2.0 header connection might bother some people who have older peripherals or all-in-one cooler USB connections that use 2.0 headers. The case itself doesn't require any USB 2.0 connections from the front I/O, but if your AIO cooler's USB controller needs a 2.0 header (some do for RGB sync), you'll need to plan your header usage carefully. It's not a dealbreaker, but it's something to be aware of. The overall I/O selection is solid for a case in this category, and the Type-C inclusion is appreciated given how many peripherals now use that connection.

The finish on the steel panels is clean, with no sharp edges on the interior that would threaten your hands during a build. I genuinely checked this carefully because I've been caught out by cheap cases with stamped edges that haven't been properly deburred. The O11 Dynamic Mini passes that test. The thumbscrews throughout the case have a decent knurling pattern that makes them easy to tighten and loosen by hand, and they don't feel like they're going to strip after a few uses.

The rubber feet are a good size and grip the desk well. The dust filter on the bottom is magnetic, which is the right design choice. Magnetic filters are so much easier to clean than the clip-in or slide-out designs that require you to move the case or contort yourself to access them. You just pull it out from the front, rinse it, let it dry, and pop it back. Simple. The overall build quality sits comfortably above what you'd expect from a case at this price point, and it's noticeably better than similarly-priced options from some other brands. The Lian Li brand consistently delivers on material quality, and this case is no exception.

The Fractal Design Pop Mini Air is smaller and lighter, making it a better choice if desk space is genuinely at a premium. It also supports ATX motherboards in its full-size version, giving you more flexibility. But the cable management experience is noticeably worse than the O11 Dynamic Mini's dual-chamber setup, and the aesthetic is more utilitarian. If you care about how your build looks through a glass panel, the O11 wins fairly easily. The Fractal is the practical choice; the Lian Li is the enthusiast choice.

The Corsair 4000D Airflow is a genuinely excellent case with better out-of-the-box airflow thanks to its mesh front panel. It supports ATX boards, has more drive bays, and comes with two included fans. But it's bigger, heavier, and the cable management, while good, doesn't have the clean separation of the dual-chamber design. If thermals are your absolute top priority and you don't mind the larger footprint, the 4000D Airflow is worth serious consideration. But for a compact enthusiast build where aesthetics and build experience matter, the O11 Dynamic Mini holds its own.

But for the builder who's going AIO, running mATX or ITX, and cares about having a clean-looking build that's genuinely pleasant to work in, this case is excellent. The dual-chamber design makes cable management so much more manageable than a traditional single-chamber layout. The build quality is above average for the price. The I/O is well-placed and includes a proper Gen 2 Type-C port. And the overall aesthetic, that cube-ish profile with the tempered glass panel showing off your components, is genuinely appealing in a way that a lot of cases at this price point aren't. Lian Li's official product page gives you the full spec breakdown if you want to cross-reference your component dimensions before committing.

The thermal performance requires more thought than a mesh-front case. You can't just throw some fans in and expect great results. You need to plan your fan configuration, ideally with a 360mm radiator on the bottom and exhaust at the rear and side. Done right, temperatures are perfectly acceptable for enthusiast hardware. Done lazily, you'll see higher-than-ideal GPU temperatures. The case rewards the builder who thinks about airflow, which is probably the right person to be buying a case like this anyway.

Priced in the mid-range bracket, it's competitively positioned against the Corsair 4000D Airflow and sits at a similar level to the Fractal Pop Mini Air. You're not getting included fans, which does add to the total build cost, and that's a genuine consideration. But the build quality and design thoughtfulness justify the price. For a compact enthusiast build in 2026, this is one of the better options available. Just go in with your eyes open about the cooler height limitation and GPU length cap, and you'll have a great time building in it.

Who should buy this: mATX or ITX builders going AIO, anyone who wants a clean showcase build in a compact footprint, builders who've been frustrated by cable management in traditional cases. Who should skip it: anyone needing ATX support, builders with tall air coolers, anyone with a flagship-tier GPU that exceeds 320mm. Solid case. Recommended with the caveats noted.