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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe LIAN LI A4-H2O is the strongest fit when minimizing case volume matters most: it is an 11 L Mini-ITX case with a top 240 mm radiator mount, subject to a strict 55 mm combined radiator-and-fan thickness limit. For a roomier build with top 280 mm support, consider the Cooler Master MasterBox NR200P V2; for listed 360 mm radiator compatibility, the taller CORSAIR 2000D AIRFLOW is the relevant option. These are compatibility-based recommendations, not thermal-performance rankings. Check the exact case revision and every component’s dimensions before buying.
Which Mini-ITX case should you choose for water cooling?
Start with the radiator size your build actually needs, then check the full cooling stack, GPU clearance, power-supply format, and installation space. A radiator label alone does not establish that the radiator, fans, fittings, graphics card, and cables will all fit together.
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- Smallest documented option: LIAN LI A4-H2O, with an 11 L volume and top support for a 240 mm radiator.
- Roomier 280 mm option: Cooler Master MasterBox NR200P V2, with an 18.25 L volume and top support through 280 mm.
- Largest radiator class here: CORSAIR 2000D AIRFLOW, which lists compatibility through 360 mm in a substantially taller enclosure.
Manufacturer compatibility figures describe fit, not comparative cooling results. The specifications below are from the manufacturers’ current product pages checked in 2026; verify the manual and compatibility guidance for the exact parts and case configuration you plan to use.
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| Case | Radiator support | Size or volume | Important fit details |
|---|---|---|---|
| LIAN LI A4-H2O | Top: 240 mm; maximum 55 mm combined radiator-and-fan thickness | 11 L; 326 × 140 × 244 mm | Mini-ITX; SFX or SFX-L PSU; GPU length 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 clearances vary with front-bracket configuration. Cooler Master specifications |
| CORSAIR 2000D AIRFLOW | 120, 140, 240, 280, or 360 mm listed; Corsair describes three 360 mm mounting locations and two simultaneous 360 mm radiators | 458 × 271 × 200 mm | Mini-ITX; SFX PSU; GPU length up to 365 mm. Confirm the intended mounting locations and clearances using Corsair’s compatibility guidance. Corsair specifications |
| Fractal Design Era 2 | PC Gamer reports top 280 mm support and says Fractal recommends 240 mm where possible; confirm with Fractal’s current manual | 366 × 165 × 314 mm, as listed by PC Gamer | Secondary-source fit guidance; installation access and part selection can be challenging. PC Gamer’s Mini-ITX case guide |
What to check before choosing a radiator
Measure the whole radiator-and-fan stack
For the A4-H2O, LIAN LI specifies a maximum combined thickness of 55 mm for the top radiator and fans. Add the radiator’s actual thickness to the fan thickness before ordering; a radiator described as “240 mm” only identifies its nominal length class, not whether its complete stack fits. Also account for fittings and tubing routing where they could meet nearby parts.
#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.
Check the GPU in the intended configuration
The published maximum GPU lengths differ: 322 mm for the A4-H2O and 365 mm for the 2000D AIRFLOW. Those figures do not replace a complete fit check. Verify the exact graphics-card dimensions, power-connector clearance, and the case’s radiator or bracket arrangement. The NR200P V2’s stated GPU clearance depends on its front-bracket configuration, so consult Cooler Master’s detailed specification for the configuration you intend to use. NVIDIA also publishes a list of SFF-Ready cases and graphics-card fit criteria; treat it as a useful cross-check for listed combinations, not a substitute for the case maker’s instructions: NVIDIA SFF-Ready.
Match the power supply and build layout
The A4-H2O and NR200P V2 specify SFX or SFX-L power supplies, while the 2000D AIRFLOW specifies SFX. Confirm the PSU’s exact dimensions and cable arrangement alongside the GPU and cooling parts. The A4-H2O uses a sandwich layout with removable panels and brackets; that design supports compact packaging, but careful part selection and assembly planning remain important in a small case.
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.
Best fit by build priority
Choose the LIAN LI A4-H2O for minimum volume
The A4-H2O is the clearest choice here if compactness is the priority and a top 240 mm radiator suits the planned components. LIAN LI describes it as an 11 L collaboration with DAN Cases, built around a sandwich layout and designed to support AIO cooling. Its principal constraint for cooling selection is the 55 mm radiator-and-fan stack limit; GPU length is specified up to 322 mm. See LIAN LI’s A4-H2O specifications.
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Choose the Cooler Master NR200P V2 for top 280 mm support
The NR200P V2 provides more room than the A4-H2O and lists top radiator support through 280 mm. It is a reasonable fit when a 280 mm radiator is a requirement and the 18.25 L chassis suits the desk or build footprint. Check Cooler Master’s GPU-clearance details against the selected front-bracket setup before assembling the build. See Cooler Master’s NR200P V2 specifications.
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
Choose the CORSAIR 2000D AIRFLOW for listed 360 mm compatibility
The 2000D AIRFLOW is the option in this comparison for a build calling for a listed 360 mm radiator. Corsair describes three 360 mm mounting locations and says two 360 mm radiators can be installed simultaneously in any two of them. Because location and component arrangement matter, use Corsair’s compatibility guidance to validate the specific radiator, GPU, and other parts. Its 458 mm height makes it a much taller enclosure than the A4-H2O. See Corsair’s 2000D AIRFLOW details.
Consider the Fractal Design Era 2 after checking its manual
PC Gamer’s 2026 guide reports top 280 mm support for the Era 2 and says Fractal recommends using a 240 mm radiator where possible to simplify installation. That is secondary editorial guidance; confirm the intended configuration in Fractal’s current manual before relying on it for a parts list.
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.
A practical compatibility checklist
- Choose radiator size and location. Use the case maker’s specifications or manual to identify supported sizes and mounting positions.
- Calculate the stack. Add the exact radiator and fan thicknesses; for the A4-H2O, the combined total must not exceed 55 mm.
- Verify GPU fit. Compare the exact card dimensions and connector clearance with the case’s documentation and intended bracket or radiator arrangement.
- Confirm PSU format. The A4-H2O and NR200P V2 list SFX/SFX-L; the 2000D AIRFLOW lists SFX.
- Check the full layout. Confirm that fittings, tubing, cables, and other components can be installed in the chosen configuration rather than relying on radiator size alone.
- Use current documentation. Check the manual for the exact case revision and the manufacturers’ compatibility guidance before purchasing parts.
What these specifications can—and cannot—tell you
The manufacturer figures establish nominal radiator support, published dimensions, and selected clearance limits. They do not show which case will produce lower temperatures or quieter operation in a particular build. That depends on the complete hardware, radiator and fan selection, airflow layout, and operating conditions; no comparative thermal test results are established here.
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 )
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