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

I've built in a lot of cases over the years, and the ones that stick in my memory are rarely the ones with the flashiest RGB or the most aggressive styling. They're the ones that made me want to throw a screwdriver across the room, or alternatively, the ones where everything just clicked into place and the build was genuinely enjoyable. The Lian Li O11 Dynamic Mini is a case I'd been curious about for a while. The full-size O11 Dynamic has been a staple of the enthusiast community for years, so when Lian Li shrank the formula down into a Mini-ITX and mATX-friendly package, I wanted to see whether they'd managed to keep what made the original great or whether something got lost in translation.

Before I get into it, let me be upfront about how I tested this. I spent several weeks building and rebuilding inside this case, running different hardware configurations to stress the thermals, the cable routing, and the general build experience. I had an AMD Ryzen 7 build in here with a 240mm AIO, a mid-range GPU pushing around 200W, and a full complement of NVMe drives. I also tried a more budget-oriented build with a tower air cooler to see how the clearances held up. So when I talk about what works and what doesn't, it's coming from actual time with the case, not a five-minute unboxing.

The Lian Li O11 Dynamic Mini PC Case Review UK (2026) sits in a genuinely competitive part of the market. Mid-range pricing means you're up against some serious competition from Fractal, NZXT, and Corsair, all of whom make very capable cases at similar money. So does the O11 Mini earn its place? Let's get into it.

Dimensions come in at approximately 285mm wide, 290mm deep, and 388mm tall. That's not tiny by any means, but it's noticeably more compact than the standard O11 Dynamic, which is closer to 460mm tall. The weight without hardware is around 6.5kg, which tells you something about the build quality. This isn't a flimsy lightweight chassis. The steel is proper gauge, the tempered glass panels have real heft to them, and the whole thing feels like it cost more than it does when you pick it up.

Fan support is generous for the size. You've got mounting positions for up to six 120mm fans or a combination of 120mm and 140mm depending on the panel. Radiator support is similarly good, with options for 240mm and 360mm radiators depending on placement. The case ships without any fans included, which is worth knowing upfront. At this price tier, some competitors do include fans, so factor that into your budget if you're starting from scratch.

The dual-chamber layout does add some depth to the design. At 290mm deep, it's not dramatically shallower than a full mid-tower, but the overall volume is significantly reduced. What you gain is a tidier visual presentation. Because the PSU and cables are hidden in the rear chamber, the main viewing area through the tempered glass side panel looks clean even before you've done any cable management. That's a genuine quality-of-life improvement, and it's one of the reasons the O11 design has been so popular.

The footprint on a desk is reasonable. The rubber feet are decent quality and grippy enough that the case doesn't slide around when you're plugging things in. The overall silhouette is boxy in a deliberate, architectural sort of way. It doesn't try to look aggressive or gamer-y, which I personally appreciate. It's a case that looks at home in a home office or a gaming setup without screaming for attention. Whether that's a pro or a con depends entirely on your taste, but I think Lian Li have got the aesthetic right here.

Installing the motherboard is straightforward. The standoffs for both form factors are pre-installed, which saves a bit of fiddling. The tray itself has a reasonable CPU cutout, though I'd describe it as adequate rather than generous. With a larger cooler backplate, you might find yourself removing the motherboard to get proper access, which is a minor annoyance. The cutout is roughly 150mm in diameter, which covers most standard backplates but isn't the oversized cutout you get on some premium cases.

One thing worth mentioning is the I/O shield situation. The case uses a traditional removable I/O shield approach rather than a pre-installed shield. That's fine, it's standard practice, but it does mean you need to make sure your motherboard's shield is properly seated before you start routing cables. I've seen people skip this step and then have to partially disassemble their build to sort it out. Don't be that person. The rear panel access is good enough that it's not a drama, but it's worth doing in the right order.

The GPU sits in the main chamber with good clearance above and below. There's no riser cable included for vertical mounting, which is a shame at this price point. Vertical GPU mounting is possible with an aftermarket riser, but you'll need to source that separately. Given how much the O11 Mini leans into the aesthetic side of things with its tempered glass panels, it feels like a missed opportunity not to include vertical mount support out of the box. That said, the standard horizontal mounting is solid. The PCIe slot covers are the thumbscrew type, which I always prefer over the break-off variety.

During my testing with an RTX 4070 Ti Super (a card that's around 305mm long), there was comfortable clearance at both ends. The front of the card sat well clear of any fan mounts or radiator brackets, and the rear bracket area was clean. GPU sag wasn't an issue with the card I tested, but heavier triple-fan cards might benefit from a sag bracket. Lian Li don't include one, but third-party options are cheap and easy to fit. Overall, the GPU situation is good for 95% of builds. Just check your specific card's dimensions if you're going big.

In practice, this case is really designed around AIO liquid cooling. The radiator support is excellent, and the layout makes AIOs look fantastic through the glass. I ran a 240mm AIO during my main testing period, mounted to the top panel, and it fit without any drama. Clearance between the radiator fans and the top of the GPU was fine with my specific card, though I'd recommend checking this carefully if you're running a particularly tall GPU cooler. The top mounting position for a 240mm radiator is the most natural choice and the one I'd recommend for most builds.

The side panel also supports a 360mm radiator, which is impressive for a case this size. I didn't test a 360mm AIO personally, but the mounting points are there and the geometry looks workable. You will need to be careful about RAM clearance with a side-mounted radiator, particularly if you're using tall heatspreaders. Low-profile RAM is the safer choice if you're going the side-mounted 360mm route. It's one of those things where the spec sheet says it fits, but real-world compatibility depends on your specific combination of components.

The 2.5-inch bays are split between the rear chamber and a couple of positions on the back of the motherboard tray. The tray-mounted positions are the ones you'll use most, and they're genuinely easy to work with. Drives mount with two screws and sit flush against the tray. Cable routing from these positions to the motherboard's SATA ports is clean and straightforward. If you're running an all-NVMe setup (which is increasingly common), you can ignore the 3.5-inch bays entirely and just use the M.2 slots on your motherboard, which keeps the rear chamber very tidy.

For a modern build, the storage situation is fine. Most people building into a case like this are going NVMe-first anyway, and the physical drive bays are there for anyone who needs mass storage or still has older HDDs in their setup. I'd have liked to see one more 2.5-inch position, but it's not a significant complaint. The more important thing is that the drive mounting doesn't interfere with cable routing, and here it doesn't. Everything has its place and there's no awkward overlap between drive cables and power cables.

Velcro straps are included, which is a nice touch. There are anchor points at sensible locations around the tray, and the straps that come in the box are actually decent quality rather than the flimsy afterthoughts you sometimes get. Cable routing holes are rubber-grommeted, which keeps things looking tidy from the front. The PSU is mounted in the rear chamber on a dedicated bracket, and because the O11 Mini requires an SFX or SFX-L PSU rather than a full ATX unit, there's noticeably more room around it than you'd get in a standard case.

The SFX PSU requirement is worth flagging prominently. SFX and SFX-L units are more expensive than equivalent ATX PSUs, sometimes significantly so. If you're budgeting for this build, factor in an extra spend on the power supply. The upside is that SFX units are genuinely excellent these days, with brands like Corsair, Seasonic, and be quiet! all making very capable SFX-L units. The cable management benefits are real and tangible. My finished build looked genuinely clean, and I'm not someone who spends hours on cable aesthetics. The case makes it easy.

With the glass side panel fitted and fans configured as bottom intake and top exhaust, my Ryzen 7 7700X sat around 75-78 degrees Celsius under sustained Cinebench load, and the RTX 4070 Ti Super peaked at around 82 degrees under a 3DMark TimeSpy loop. Those are perfectly acceptable numbers, not class-leading, but not concerning either. Swapping to the mesh side panel and adding a side-intake fan dropped CPU temps by around 4-5 degrees and GPU temps by a similar margin. So the mesh panel does make a meaningful difference if thermals are your priority.

The included fan situation, or rather the lack of it, does mean you need to think carefully about your fan configuration from the start. I'd recommend a minimum of three fans: two as bottom intake and one as top exhaust. Adding a side fan if you go the mesh panel route is worthwhile. Lian Li's own fans are good quality if you want to keep things visually consistent, but any reputable 120mm fan will work fine. The fan mounting points are all standard 120mm spacing, so you're not locked into anything proprietary. Dust filtration is present on the bottom and is easy to maintain, though the top exhaust position doesn't have a filter, which is typical for exhaust positions.

The USB Type-C port is a genuine highlight. It's a Gen 2 port running at 10Gbps, which means it's actually useful for fast external storage and modern peripherals rather than just being a checkbox feature. The internal header requires a USB 3.1 Gen 2 Type-C connector on your motherboard, which is standard on most current mATX and ITX boards but worth checking if you're using an older platform. The Type-A ports are USB 3.0 (5Gbps), which is fine for mice, keyboards, and USB drives.

The audio jack is a combined 3.5mm TRRS connector rather than separate headphone and microphone jacks. That's increasingly common and works fine with modern headsets that use a single connector, but if you have separate headphone and microphone cables, you'll need a splitter adapter. It's a small thing, but worth knowing. Overall, the I/O selection is good for the size. I'd have liked a second Type-C port, but that's a wish rather than a complaint. The placement on the top panel means cables don't dangle awkwardly at the front, which is a practical win.

Sharp edges? I didn't find any. And I specifically went looking, running my fingers along every internal edge I could reach during the build. The steel is properly deburred and rolled at the edges. This sounds like a basic requirement, but you'd be surprised how many cases at this price point still have edges that'll catch your hand if you're not careful. Lian Li have been doing this long enough to know that sharp edges are unacceptable, and it shows. The screw quality is also good. The thumbscrews are metal with knurled edges that actually give you enough grip to tighten properly.

The aluminium trim on the exterior adds a premium feel that the spec sheet doesn't fully convey. The top panel in particular has a brushed aluminium finish that looks and feels expensive. Panel alignment across the whole case is tight, with consistent gaps and no misaligned panels. The rubber feet are chunky and grippy. Even the packaging is good, with foam inserts that protect the glass panels properly. It all adds up to a case that feels worth the mid-range price tag. You're not paying for marketing here. You're paying for actual quality.

The Fractal Pop Mini Air has better out-of-the-box airflow thanks to its mesh front, and it supports full ATX PSUs, which is a meaningful cost saving if you're not already invested in SFX. But it lacks the dual-chamber design, so cable management is more conventional and the interior doesn't look as clean. The NZXT H510 Flow is a beautifully built case with excellent cable management, but it only supports two fans natively and the airflow, while improved over the original H510, still lags behind mesh-front designs.

Where the O11 Mini wins is in the combination of build quality, aesthetics, and the dual-chamber layout. If you care about how your build looks and you're willing to invest in SFX power supply and proper fans, it's the most satisfying of the three to build in and to look at. If you're prioritising thermals above all else, or you want to use an ATX PSU, the Fractal is probably the smarter choice. The NZXT sits somewhere in between but at a similar price, and I'd personally take the O11 Mini over it for most builds.

The dual-chamber design is the star of the show. Cable management is genuinely easy, the finished build looks clean, and the build experience is one of the more enjoyable I've had in a case this size. Build quality is excellent throughout, from the thick tempered glass to the deburred steel edges to the quality thumbscrews. Lian Li clearly know how to make a case, and the Mini is a proper distillation of what makes the O11 lineup special.

The compromises are real though. You need an SFX or SFX-L PSU, which adds cost. No fans are included, so budget for at least three good 120mm units. CPU cooler clearance is tight with the glass side panel, making this effectively an AIO-mandatory build if you want the full aesthetic. And if you're running very high-end hardware that generates serious heat, a mesh-front case will serve you better thermally. But for a mid-range to high-end build where you care about how it looks and how it feels to put together, the O11 Mini is a genuinely excellent choice. I'd score it an 8.5 out of 10. It's not perfect, but it's very, very good.

You can check the current UK price using the link below. Given what you get for the money, it sits at a competitive point in the mid-range segment, and I think most builders who go for it will be happy with the decision.