The Phanteks XT Pro Ultra wins in 6 out of 8 comparable specs. Its biggest advantage is Max Cooler Height (229% better).
A4-H2O wins in 1 spec (MSRP: 24% better).
Recommendation
Choose XT Pro Ultra if you want the best overall performance — especially max cooler height.
Choose A4-H2O if msrp matters more to you.
| Spec | Lian LiA4-H2O | PhanteksXT Pro Ultra |
|---|---|---|
| Design | ||
| Type | Mini ITX | ATX Mid Tower |
| Side Panel | Tempered Glass | Tempered Glass |
| Weight | 3.5 | 10.5 |
| Compatibility | ||
| Max GPU Length | 322 mm | 435 mm+35% |
| Max Cooler Height | 55 mm | 181 mm+229% |
| Max PSU Length | 130 mm | 220 mm+69% |
| Max Radiator |
| 240 mm |
| 420 mm+75% |
| Motherboard Support | Mini ITX | ATX, EATX, Micro ATX, Mini ITX |
| Cooling | ||
| Included Fans | 0 | 4+100% |
| Storage | ||
| 2.5" Bays | 3 | 3 |
| 3.5" Bays | 0 | 2+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 | $130−24% | $170 |
| Release Date | Jan 2022 | Jul 2024 |
