The Lian Li O11 Air Mini wins in 7 out of 8 comparable specs. Its biggest advantage is Max Cooler Height (182% better).
A4-H2O wins in 1 spec (2.5" Bays: 50% better).
Recommendation
Choose O11 Air Mini if you want the best overall performance — especially max cooler height.
Choose A4-H2O if 2.5" bays matters more to you.
| Spec | Lian LiA4-H2O | Lian LiO11 Air Mini |
|---|---|---|
| Design | ||
| Type | Mini ITX | ATX Mid Tower |
| Side Panel | Tempered Glass | Tempered Glass |
| Weight | 3.5 | 7.5 |
| Compatibility | ||
| Max GPU Length | 322 mm | 362 mm+12% |
| Max Cooler Height | 55 mm | 155 mm+182% |
| Max PSU Length | 130 mm | 180 mm+38% |
| Max Radiator |
| 240 mm |
| 280 mm+17% |
| Motherboard Support | Mini ITX | ATX, EATX, Micro ATX, Mini ITX |
| Cooling | ||
| Included Fans | 0 | 3+100% |
| Storage | ||
| 2.5" Bays | 3+50% | 2 |
| 3.5" Bays | 0 | 4+100% |
| I/O | ||
| Front I/O | 1x USB-C, 1x USB-A 3.0 | 1x USB-C, 2x USB-A 3.0, Audio |
| Price | ||
| MSRP | $130 | $110−15% |
| Release Date | Jan 2022 | Sep 2021 |
