This article covers LIANLI PCIe 4.0対応 スモールフォームファクターPCケース A4-H2O シルバー Mini-ITX対応 最大322mmトリプルスロットGPU搭載可能 USB 3.1 type Cコネクタ搭載 SFX.

Overview

The LIAN LI A4-H2O is a compact 11-liter Mini-ITX case developed in collaboration with DAN Cases. It adopts a sandwich layout that allows for a triple-slot graphics card up to 322mm and a 240mm AIO liquid cooler, which is remarkable for a case of this size. The silver model covered here ships with a PCIe 4.0 riser cable included.
The exterior uses aluminum panels while the internal frame is made of SPCC steel, giving it a sharp look and solid rigidity. Front, side, top, and bottom panels are all tool-free removable, making component installation and cable management easier than typical SFF cases.
This case targets users who want high-end hardware in a small footprint on their desk. It has become a well-known staple in the SFF community for balancing minimal aesthetics with strong hardware support.

Compatibility Guide

The A4-H2O supports Mini-ITX motherboards only. Micro-ATX and ATX boards will not fit, so double-check your motherboard form factor before purchasing.
Power supply support is limited to SFX and SFX-L units. A standard ATX PSU cannot be installed, so you will need to source an SFF power supply separately.
Graphics cards up to 322mm in length and triple-slot thickness are supported. However, depending on the GPU's exact dimensions and the routing of power cables, clearance can get tight, so measuring your components is advisable.
CPU cooler clearance is 55mm for air coolers, or you can mount a 240mm AIO radiator on the top panel. This makes high-end air coolers impractical, pushing most builders toward liquid cooling.
The front panel includes a USB 3.1 Type-C connector for fast peripheral connections. Storage is limited to 2.5-inch drives.

Product Info

The A4-H2O was released in 2022 and sits in the mid-to-high tier of SFF cases. It inherits the sandwich layout concept from the DAN Cases A4-SFX while significantly improving hardware compatibility, notably supporting triple-slot GPUs and 240mm AIOs.
The price is higher than typical ATX mid-tower cases but reasonable compared to other premium SFF options. In Japan, it is sold through official distributors and comes with a one-year warranty.
Two versions are available: PCIe 3.0 and PCIe 4.0, each offered in black or silver. The silver PCIe 4.0 model reviewed here is the one to choose if you want to maximize bandwidth with a modern GPU.

Best Use Cases

First, gamers who want to save desk space. The 11-liter footprint fits a triple-slot high-end GPU and a 240mm AIO, so you can build a powerful gaming rig without a large tower.
Second, users who care about aesthetics in living rooms or studies. The aluminum panels give a premium feel, and the silver finish blends well with other electronics and furniture.
Third, those building a portable secondary PC. The compact and sturdy construction makes it suitable for LAN parties or travel.
On the other hand, users who prioritize expandability should look elsewhere. If you need 3.5-inch drives or multiple PCIe cards, an ATX mid-tower is a better choice.

Things to Consider

This case is Mini-ITX only, so motherboard options are limited. You will also need dedicated parts like an SFX power supply and the included riser cable, which adds to the overall cost.
The 55mm CPU cooler height limit rules out large air coolers. If you plan to run a high-end CPU on air, you will need to consider a 240mm AIO instead.
While the maximum GPU length is 322mm, real-world clearance can be affected by cable routing and internal space. Always verify the dimensions of your GPU and PSU before committing to a build.

FAQ

Q: Can I use an ATX power supply?
A: No, the A4-H2O only supports SFX or SFX-L power supplies. If you have an ATX PSU, you will need a different case.
Q: Will any 240mm AIO cooler fit?
A: The case supports 240mm radiators, but radiator thickness and fan type can affect fit. Check the official case specs against your cooler's dimensions before buying.
Q: What is the difference between the PCIe 3.0 and PCIe 4.0 models?
A: The included riser cable differs. The PCIe 4.0 model takes full advantage of modern motherboard and GPU bandwidth, while the PCIe 3.0 model is a cost-saving option for older hardware.

Product Disclosure (Amazon)

  • Manufacturer: Lian Li
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B09T74VNYS
  • Note: This article covers a manufacturer-made product based on Amazon listing details.