Micro-ATX (mATX) motherboards measure 244 × 244mm and require a case that supports this form factor. Virtually all ATX mid towers also accept mATX boards, giving builders a very wide choice. There are also dedicated mATX mini tower cases that are more compact than full ATX towers. This page covers both categories, listing every notable option available in the UK with full specifications.
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Dedicated mATX Cases vs Using an ATX Case
There is an important distinction between a case designed specifically for mATX boards and an ATX mid tower that happens to accept mATX. Understanding the difference helps you choose the right enclosure for your build.
Dedicated mATX cases are built around the smaller motherboard footprint, resulting in a narrower or shorter chassis. The benefit is a reduced desk footprint — these cases can be meaningfully smaller than a standard ATX tower. The trade-off is that internal volume is reduced, which limits fan mounting options, radiator support, and cable management space. GPU length clearance may also be shorter than in a full ATX mid tower.
ATX mid towers that support mATX are simply standard-sized cases with a motherboard tray that accommodates the smaller board. Builders retain all the space, airflow options, and drive bays of a full ATX build while using a more affordable mATX platform. The case is no smaller than it would be with an ATX board installed.
A dedicated mATX case makes practical sense in the following situations:
- Space-constrained desks or shelving where overall case dimensions matter
- Secondary or office PCs where compactness is preferred over expandability
- Living room or media centre builds where a lower-profile chassis is desirable
- Budget builds where a smaller case costs less than a full mid tower
- Users who want a smaller footprint without the strict size and cooling constraints of Mini-ITX
If internal space, cooling headroom, or GPU clearance is a priority, fitting an mATX board into a full ATX mid tower is usually the better choice.
All Dedicated Micro-ATX Cases UK — Specifications
The following table covers every notable dedicated mATX case available in the UK. Dimensions are approximate and vary by source. GPU clearance and CPU cooler height figures are as specified by the manufacturer.
| Case | Dimensions (H × W × D mm) | GPU clearance | CPU cooler height | Fan slots | Radiator support | Drive bays | Price range | Link |
|---|---|---|---|---|---|---|---|---|
| Fractal Design Pop Mini | 395 × 210 × 381 | 321mm | 170mm | 3× 120mm or 2× 140mm | 240mm front, 120mm rear | 2× 3.5″, 2× 2.5″ | £70–£90 | View on Amazon |
| Cooler Master Q300L | 387 × 230 × 378 | 360mm | 157mm | 3× 120mm | 240mm side, 120mm top/rear | 1× 3.5″, 2× 2.5″ | £50–£70 | View on Amazon |
| Phanteks Eclipse P300 | 460 × 200 × 430 | 395mm | 160mm | 3× 120mm or 2× 140mm | 240mm front, 120mm rear | 2× 3.5″, 2× 2.5″ | £55–£75 | View on Amazon |
| Deepcool Matrexx 40 | 395 × 207 × 382 | 320mm | 155mm | 2× 120mm front, 1× 120mm rear | 240mm front | 1× 3.5″, 2× 2.5″ | £45–£65 | View on Amazon |
| Silverstone ML07 (HTPC slim) | 112 × 380 × 430 | 267mm (low-profile slot) | 83mm (low-profile only) | 2× 120mm or 140mm | None | 1× 3.5″, 2× 2.5″ | £70–£95 | View on Amazon |
| Thermaltake Versa H17 | 393 × 192 × 376 | 350mm | 155mm | 2× 120mm front, 1× 120mm rear | 120mm rear only | 2× 3.5″, 1× 2.5″ | £35–£55 | View on Amazon |
| NZXT H510 (supports ATX + mATX) | 460 × 210 × 428 | 381mm | 165mm | 2× 120mm (1 front, 1 rear) | 240mm front, 120mm rear | 1× 3.5″, 2× 2.5″ | £65–£85 | View on Amazon |
| Corsair 3000D (supports ATX + mATX) | 467 × 230 × 475 | 360mm | 170mm | 3× 120mm front, 1× 120mm rear | 360mm front, 120mm rear | 2× 3.5″, 2× 2.5″ | £65–£85 | View on Amazon |
Note: The Silverstone ML07 is an HTPC (Home Theatre PC) form factor — it lies flat rather than standing upright, and requires a low-profile CPU cooler. It is not suitable for high-performance builds with discrete GPUs.
ATX Mid Towers That Support Micro-ATX
All standard ATX mid towers include mounting points for mATX motherboards. Fitting an mATX board into a full ATX mid tower is a common approach that gives the builder access to superior cooling options, more drive bays, and greater cable management space while using a compact and often more affordable motherboard platform.
The following ATX mid towers are among the most popular options available in the UK, all of which accept mATX boards:
- Fractal Design North — a wood-panelled design with excellent airflow, front mesh option, supports up to 360mm radiators. View on Amazon
- Corsair 4000D Airflow — high-airflow front mesh panel, 360mm radiator support, tool-free drive installation. View on Amazon
- Lian Li Lancool 216 — dual 160mm fans included, excellent out-of-box airflow, 420mm GPU clearance. View on Amazon
- be quiet! Pure Base 500DX — three pre-installed Pure Wings fans, good acoustic dampening, 360mm front radiator support. View on Amazon
- NZXT H7 Flow — clean cable management, 420mm GPU clearance, perforated front for improved intake. View on Amazon
Any of these ATX cases will accommodate an mATX board with no modification. The unused upper motherboard mounting holes simply remain empty.
GPU Clearance in mATX Cases
GPU clearance is one of the most important considerations when choosing a dedicated mATX mini tower. Compact cases often have a shorter internal depth, which limits the length of graphics card that can physically fit. Modern high-end GPUs — particularly triple-fan models — frequently exceed 340mm in length.
| Case | GPU clearance | Notes |
|---|---|---|
| Fractal Design Pop Mini | 321mm | Fits most dual-fan cards; some triple-fan cards may exceed this |
| Cooler Master Q300L | 360mm | Accommodates most triple-fan cards up to 360mm |
| Phanteks Eclipse P300 | 395mm | One of the most generous clearances in a dedicated mATX case |
| Deepcool Matrexx 40 | 320mm | Suitable for dual-fan GPUs; verify length of triple-fan cards before purchasing |
| Silverstone ML07 | 267mm (low-profile slot) | Low-profile only; not suitable for full-height discrete GPUs |
| Thermaltake Versa H17 | 350mm | Fits most mainstream GPUs; check exact dimensions for high-end cards |
| NZXT H510 | 381mm | Handles most triple-fan consumer GPUs comfortably |
| Corsair 3000D | 360mm | Good clearance for a case in this price bracket |
For reference, a standard RTX 4070 dual-fan card measures approximately 300mm. An RTX 4080 Super triple-fan reference-style card may reach 336mm or more depending on the AIB partner. Always verify the exact GPU dimensions against the case specification before purchasing.
Cooling Limitations in Compact mATX Cases
Thermal management is where dedicated mATX mini towers show their most significant constraints compared with full ATX mid towers. The reduced internal volume directly limits the number of fans that can be mounted and the size of radiator that will fit.
Most compact mATX mini towers support a 240mm AIO radiator in the front panel — this is the practical ceiling for the majority of cases in this category. The Fractal Design Pop Mini and Phanteks Eclipse P300 both support 240mm front radiators, which is adequate for mainstream processors under typical workloads.
A 360mm AIO radiator — which requires three 120mm fan positions in a row — is not physically possible in most dedicated mATX cases due to limited front panel height or depth. The Corsair 3000D is an exception, supporting a 360mm front radiator, but it is closer in dimensions to a standard ATX mid tower. For 360mm AIO compatibility, choosing an ATX mid tower such as the Corsair 4000D Airflow, Fractal Design North, or Lian Li Lancool 216 is the more straightforward route.
Additional cooling considerations in compact mATX cases:
- Fan count is typically limited to three or four positions total, compared with five or six in a full ATX mid tower
- Top-mounted fan or radiator support is absent in many mini towers, restricting exhaust options
- Cable management space behind the motherboard tray is often narrow, which can impede rear panel airflow if cables are not routed carefully
- High-TDP CPU coolers (tower coolers exceeding 160mm height) may not fit in the most compact options
For builds using a mid-range CPU such as an Intel Core i5 or AMD Ryzen 5 with a stock or budget tower cooler, a compact mATX case presents no practical thermal issues. For high-performance builds with a power-hungry CPU and a top-tier GPU, the thermal headroom of a full ATX mid tower is preferable.
Who Should Use a Dedicated mATX Case
A dedicated mATX mini tower is a practical choice in a number of specific scenarios:
- Budget builds — entry-level cases such as the Thermaltake Versa H17 bring the total build cost down without compromising compatibility with standard components
- Office and workplace PCs — compact footprint fits under a desk or on a shelf; mATX boards often cost less than full ATX equivalents at the same performance tier
- Secondary home PCs — a second rig for a family member, a spare machine, or a remote desktop node does not need the expansion capacity of a full tower
- Living room and media centre builds — the Silverstone ML07 HTPC chassis fits under or beside a television; standard mini towers can also work in an entertainment unit if dimensions allow
- Users stepping down from Mini-ITX — mATX offers more expansion slots, dual-channel memory across four slots, and greater cooler compatibility than ITX, while still being notably smaller than ATX if a compact case is chosen
Users who intend to install a high-end GPU, a 360mm AIO cooler, multiple storage drives, or expansion cards beyond a GPU should assess whether the internal space of their chosen dedicated mATX case is sufficient before committing. In those cases, an ATX mid tower accepting an mATX board is likely the more sensible approach.
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