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Ranked #3 of 5Reviewed by Mike Hun·May 18, 2026

Lian Li A4-H2O

Averaged from + undefined
The verdict

The A4-H2O is what you build when you've decided 11 liters is the goal and you're willing to accept the trade-offs to get there. The sandwich layout mounts the GPU behind the motherboard, the removable front and top open up surprisingly easily for a case this small, and the 240 mm AIO support is the differentiating feature against most cases in this volume class. Cable management is the dealbreaker for some builders — there's almost nothing in the way of dedicated routing. GamersNexus calls cable management the case's main flaw; everything else is praised.

Lian Li A4-H2O

Strengths

  • +11 L volume — among the smallest cases that still fit triple-slot GPUs
  • +Designed around 240 mm AIO water cooling, with removable top bracket for radiator install
  • +Mesh on all four user-facing panels keeps thermals manageable despite the tight volume
  • +Aluminum exterior and SPCC steel interior — premium build feel for the price
  • +Comes with a PCIe 4.0 riser cable; PCIe 5.0 revision available for RTX 50-series builds

Watch-outs

  • −Cable management is the most-cited frustration — no dedicated tie-downs or channels
  • −Limited drive support (no 3.5" bays) by design — NVMe-only builds are expected
  • −SFX power supply only, and clearance for SFX-L is tight
  • −Build difficulty is higher than the Cooler Master NR200 or Fractal Design Terra

How it compares

The A4-H2O is the smallest case in this round-up at 11 L vs the Cooler Master NR200's 18.25 L and Hyte Revolt 3's 18.4 L. Vs the Fractal Design Terra (10.4 L), the A4-H2O trades the Terra's wood-and-aluminum finish for a stronger mesh airflow story and proper 240 mm AIO support. Not the build for first-timers — the Jonsbo C6-ITX and Cooler Master NR200 are both significantly easier to work in.

Who this is for

At a glance: experienced SFF builders who want the smallest possible case that still fits a triple-slot GPU and 240 mm AIO.

Why you’d buy the Lian Li A4-H2O

  • 11 L volume — among the smallest cases that still fit triple-slot GPUs.
  • Designed around 240 mm AIO water cooling, with removable top bracket for radiator install.
  • Mesh on all four user-facing panels keeps thermals manageable despite the tight volume.

Why you’d skip it

  • Cable management is the most-cited frustration — no dedicated tie-downs or channels.
  • Limited drive support (no 3.5" bays) by design — NVMe-only builds are expected.
  • SFX power supply only, and clearance for SFX-L is tight.

Rating sources

gamersnexus
4/5
“The main complaint with the A4-H2O is cable management — it's more non-existent than it is bad, as there aren't any dedicated cable management features or tie-downs.”

Our 4.4 score is the average of these published ratings. More about methodology.

Frequently asked questions

Is the Lian Li A4-H2O worth buying?
The A4-H2O is what you build when you've decided 11 liters is the goal and you're willing to accept the trade-offs to get there. The sandwich layout mounts the GPU behind the motherboard, the removable front and top open up surprisingly easily for a case this small, and the 240 mm AIO support is the differentiating feature against most cases in this volume class. Cable management is the dealbreaker for some builders — there's almost nothing in the way of dedicated routing. GamersNexus calls cable management the case's main flaw; everything else is praised.
What is the Lian Li A4-H2O's biggest strength?
11 L volume — among the smallest cases that still fit triple-slot GPUs
What is the main drawback of the Lian Li A4-H2O?
Cable management is the most-cited frustration — no dedicated tie-downs or channels
What sources back the 4.4/5 rating?
Our 4.4/5 rating is the average of scores from 1 independent mini-itx cases review — gamersnexus. Click any source on the product page to read the original review.

How it compares

See all 5 →
Fractal Design Terra
#1 · Top Score

Fractal Design Terra

The Terra wins on materials and editorial consensus, but you pay for it — the Cooler Master NR200 hits ~80% of the build experience for ~40% of the price. Vs the Lian Li A4-H2O, the Terra prioritizes air-cooled aesthetic builds over the A4-H2O's AIO-friendly mesh layout. The Hyte Revolt 3 is a different shape entirely (tower with handle) and the Jonsbo C6-ITX is the value alternative for builders who want mesh airflow without the premium pricing.

Cooler Master NR200
#2

Cooler Master NR200

The NR200 is the value pick that everyone benchmarks against. The Fractal Design Terra wins on materials and finish but costs 2.5x more; the Lian Li A4-H2O is roughly half the volume but loses out on cable management space. The Hyte Revolt 3 trades the NR200's cubic layout for a vertical tower with carry handle. The Jonsbo C6-ITX is even cheaper but compromises on triple-slot GPU clearance.

Hyte Revolt 3
#4

Hyte Revolt 3

Unique in this lineup as the only vertical-tower Mini-ITX case with a built-in handle — the Cooler Master NR200, Fractal Design Terra, and Lian Li A4-H2O are all cubic or sandwich layouts. Vs the Jonsbo C6-ITX, the Revolt 3 has better build quality and includes Type-C front I/O. It's pricier than both budget picks but justified if portability is a real use case.

Jonsbo C6-ITX
#5

Jonsbo C6-ITX

The budget pick in this round-up. Loses to every other case here on GPU clearance (255 mm vs 322-335 mm), but undercuts the Cooler Master NR200 on price while offering ATX PSU support and more mesh area. Vs the Hyte Revolt 3, the C6-ITX is the half-price alternative for builders who don't need a serious carry handle.

Lian Li A4-H2O
4.4/5· $156
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