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For the smallest water-cooled Mini-ITX build in this comparison, the LIAN LI A4-H2O is the clearest fit: it is an 11 L case with a top 240 mm radiator mount and a strict 55 mm maximum for the combined radiator-and-fan stack. Choose the roomier Cooler Master MasterBox NR200P V2 for top radiators up to 280 mm, or the taller CORSAIR 2000D AIRFLOW if your plan calls for listed 360 mm radiator compatibility. These are compatibility-based recommendations, not thermal-performance rankings.
Mini-ITX water-cooling cases at a glance
Radiator capacity is only one part of the decision. Case volume, radiator location, radiator-plus-fan thickness, GPU dimensions, power-supply format, and room to install components all affect whether a build will fit.
| Case | Documented radiator support | Volume or dimensions | Other fit details |
|---|---|---|---|
| LIAN LI A4-H2O | Top 240 mm; maximum combined radiator-and-fan thickness 55 mm | 11 L; 326 × 140 × 244 mm | Mini-ITX; SFX or SFX-L PSU; GPU up to 322 mm; two top 120 mm fan positions. LIAN LI specifications |
| Cooler Master MasterBox NR200P V2 | Top 120, 140, 240, or 280 mm | 18.25 L; 372 × 185 × 292 mm including protrusions | Mini-ITX; SFX or SFX-L PSU; GPU clearance depends on front-bracket configuration. Cooler Master specifications |
| CORSAIR 2000D AIRFLOW | 120, 140, 240, 280, or 360 mm listed; page describes three 360 mm mounting locations and support for two 360 mm radiators at once | 458 × 271 × 200 mm | Mini-ITX; SFX PSU; GPU up to 365 mm. Check the intended radiator location and component combination in Corsair’s product guidance. |
| Fractal Design Era 2 | PC Gamer reports top 280 mm support and says Fractal recommends 240 mm where possible | 366 × 165 × 314 mm, as listed by PC Gamer | Radiator guidance here is secondary-source information; confirm fit in Fractal’s current manual. PC Gamer’s Era 2 coverage |
Manufacturer dimensions and compatibility claims are specifications, not comparative cooling tests. The cited product pages were checked in 2026; revisions and availability may vary by region.
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Which case should you choose?
LIAN LI A4-H2O: smallest-volume 240 mm option
At 11 L, the A4-H2O is the choice when minimizing case volume matters more than fitting a larger radiator. LIAN LI describes its sandwich layout as a collaboration with DAN Cases and specifies a top 240 mm radiator position. The combined radiator-and-fan thickness must not exceed 55 mm, so check the actual thickness of both parts rather than relying on the radiator’s nominal size. The case supports SFX and SFX-L power supplies and GPUs up to 322 mm.
#1 Best Overall
- Ample Interior: Explore ample interior space for Micro-ATX or Mini-ITX motherboards, ensuring easy and future expansion
- Components Clearance: Accommodates CPU coolers with a max height of 159mm, GPU cards up to 360mm, and PSU up to 160mm in length.
- Versatile Cooling: Maximize cooling performance with a 240mm liquid cooler and 5 fans.
- Modular I/O Panel: You have the flexibility to adjust its position at the front, top, or bottom on both sides
- Edge-To-Edge Panel: Show off your meticulous build through the transparent side panel with pride.
Cooler Master NR200P V2: room for a top 280 mm radiator
The 18.25 L NR200P V2 offers a top mount for radiators up to 280 mm. Its larger volume may be preferable if the A4-H2O’s tight layout or 55 mm cooling-stack limit rules out your chosen parts. Cooler Master’s stated GPU clearances depend on the front-bracket configuration, so use the specification for the exact setup rather than treating one maximum as universal. It supports Mini-ITX and SFX or SFX-L power supplies.
CORSAIR 2000D AIRFLOW: listed support through 360 mm
The 2000D AIRFLOW is substantially taller than the other options here, measuring 458 × 271 × 200 mm. Corsair lists radiator compatibility up to 360 mm and describes three 360 mm mounting locations, with two 360 mm radiators installable simultaneously in any two of them. The case is specified for Mini-ITX boards, SFX power supplies, and GPUs up to 365 mm. Confirm the precise clearance and mounting arrangement for your selected parts using Corsair’s compatibility guidance.
Rank #2
- JONSBO/JONSPLUS Z20 Mini Micro-ATX PC with Detachable Carrying handle-Built with only about 20L of volume, be easily placed in various desktop environments..Easier to build your PC,More convenient
- Thick to 2mm integrated bent steel panels (panel + top panel)Complemented by a large area of delicate square openings,matx case Combines heat dissipation and craftsmanship,Comprehensive Coverage Magnetic Dust Filter
- Innovative Design: Removable PCI-E Fixing Piece to Optimize the Installation Experience for Longer GPU PC Case with handle
- [FAN]TOP 120mm*2/140mm*2 Bottom 120mm*2/140mm*2 Real 120mm*1 /92mm*1 [GPU Clearance]：Up to 363mm，depends on other hardware configurations Please refer to the 'Sixth Image' for GPU compatibility.
- 【ATX PSU】 ATX/SFX/SFX-L The power supply can be adjusted in multiple gears. It is recommended to check the picture for detailed introduction to prevent interference from different hardware. It supports SFX side mounting.
Fractal Design Era 2: verify radiator details first
PC Gamer’s comparison reports top 280 mm radiator support and says Fractal recommends using a 240 mm radiator where possible to simplify installation. Treat those details as secondary guidance: consult the current Fractal manual for exact fit before choosing the Era 2 for a particular loop.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsHow to check whether your parts will fit
- Confirm the exact case revision. Open the manufacturer’s page and manual for the specific model, then check the radiator position and any configuration-dependent limits. Do not assume that a similarly named case has identical clearances.
- Check the full radiator stack. Add the radiator and fan thicknesses and compare the total with the case limit. For the A4-H2O, that combined figure must be no more than 55 mm. Also check whether fittings, tubes, or nearby parts need additional room.
- Measure the graphics card in the intended configuration. Compare its length and other relevant dimensions with the case’s stated GPU clearance. Check power-connector clearance too; a card that meets the length figure may still conflict with a side panel or another component. NVIDIA’s SFF-Ready case table provides another reference for selected cases, but the exact case and card documentation should guide your build.
- Match the power supply to the case. The A4-H2O and NR200P V2 list SFX and SFX-L support; the 2000D AIRFLOW lists SFX. Check the PSU’s physical dimensions and cable routing against the case manual.
- Review installation access before buying. Removable panels and brackets can make assembly more manageable, but they do not remove the need to plan component order and cable routing. PC Gamer warns that the Era 2 can be challenging in parts selection and build access; that is not a universal ranking of build difficulty.
What radiator size does—and does not—tell you
A 360 mm radiator needs a case with the space and mounting arrangement for it; that requirement makes the 2000D AIRFLOW a different physical proposition from the 11 L A4-H2O. But radiator labels alone do not establish which case will cool a particular CPU or GPU better. The available specifications establish fit, not measured thermal results. Cooling also depends on the components, radiator and fans selected, airflow, and the overall loop or cooler configuration.
Quick Recap
Best Value
- JONSBO TK-0 BLACK Separated Cabinet Mini ITX Pc Case, ITX Desktop sff case,compact -Easy horizontal and vertical desktop placement，Walnut Wood.
- 【2.5 surface curved glass perspective】, suitable for desktop multi-angle arbitrary place ment of display surface
- 【Design material characteristics】： *Aluminum alloy + steel +16mm Wood veneer+ 270° Dual-Curved Glass side view- multi-angle hardware display(No need to remove the protective film when using) *Removable Al PCI cover for easy removal of GPU. *Dual warehouse structure,easy to manage cables and hardware Easier to build your PC,More convenient.
- 【Hardwares support】Motherboard:ITX / SFX PSU160mm /GPU:230mm/Drive Bay:3.5"HDD*1/2.5"SSD*1
- 【Cooling system】: CPU Cooler H:137mm Top 120mm*1/140mm*1 (OPT )/Bottom 120mm*1/140mm*1 (OPT)/Rear 90mm*2 (OPT )
Rank #4
- Compact 26.3L Design, Big Hardware Support: Accommodates mATX/ITX motherboards with 4 expansion slots and GPUs up to 415mm—achieve a compact footprint without sacrificing performance.
- High Airflow Steel Mesh Panels: Designed with steel mesh side and top panels for optimal airflow, making it perfect for high-TDP GPUs and radiator setups.
- Supports 360mm Radiators and Up to 10 x 120mm Fans: Capable of housing a 360mm radiator and multiple 120mm fans—include a simple fan/radiator placement diagram in the images for clarity.
- Flexible PSU Installation (Front/Side): Compatible with ATX/SFX/SFX-L and LIAN LI EDGE power supplies; orientation options enhance clearance and cable management.
- Stylish Wood Front Panel with Modular Design: Features a walnut wood front panel and a modular structure, ideal for creating compact, clean, and minimalist PC builds.
Rank #3
- 【Ultra Mini ITX Case with PCIe 3.0 Riser Cable】The Case is only 4.3L capacity, the size is 18.4x10.4x22.3 cm (7.3x4.1x8.8 inch), PCI 3.0 Riser Cable is 18.5cm
- 【Compatibility Accessories】Support Standard ITX Motherboard(17x17cm), FLEX-Small 1U Power Supply (15*4*8cm), Graphics Card (17*10*4cm), Hard Disk(2x2.5inch SSD, thickness less than 9mm), CPU Cooler(Less than 36mm)
- 【High-quality Material】The Body of Case is made of 2.0mm Aluminum Alloy, which has good heatsink performance anf beautiful appearance
- 【Packing Include】1* Mini ITX Case, 1*PCIe 3.0 Riser and some Screws ONLY
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.
