Is anything not checked?

Lian Li doesn't publish a height limit for the A4-H2O, so that isn't checked until we measure the case ourselves.

Where do these numbers come from?

Lian Li's published spec, not yet measured by Respec; card size from ASUS's spec page. Checked October 2026. Makers measure differently and connectors add a few millimetres, so treat a tight result as a reason to measure.

Every card in the A4-H2O

Will it fit

Does the ASUS Prime GeForce RTX 5080 OC fit in the Lian Li A4-H2O?

Fits

Yes. The ASUS Prime GeForce RTX 5080 OC fits the Lian Li A4-H2O with 18 mm of length to spare.

Length304 of 322 mm18 mm spare

Height126 mmNot published

Thickness2.5 of 3 slots0.5 slots spare

Exact measurements

Size	ASUS	A4-H2O	Room
Length	304 mm	322 mm	18 mm spare
Height	126 mm	—	Not published
Thickness	2.5 slots	3 slots	0.5 slots spare

Lian Li's published spec, not yet measured by Respec

Rather have it built?

We build the RTX 5080 into small PCs by hand, each tested and shipped with its own benchmark results.

Respec Mini Creator$5,099AMD Ryzen 9 9950X · NCASE M2

Questions

Does the ASUS Prime GeForce RTX 5080 OC fit in the Lian Li A4-H2O?: Yes. The ASUS Prime GeForce RTX 5080 OC fits the Lian Li A4-H2O with 18 mm of length to spare. Length 304 of 322 mm, height 126 mm (no published limit), thickness 2.5 of 3 slots.
Is anything not checked?: Lian Li doesn't publish a height limit for the A4-H2O, so that isn't checked until we measure the case ourselves.
Where do these numbers come from?: Lian Li's published spec, not yet measured by Respec; card size from ASUS's spec page. Checked October 2026. Makers measure differently and connectors add a few millimetres, so treat a tight result as a reason to measure.

Sources

Case: Lian Li’s A4-H2O specifications, checked October 23, 2026. Lian Li publishes a length limit and a slot count (triple slot), not a height or a thickness in millimetres.
Card: ASUS’s spec page, checked October 23, 2026.
Lian Li doesn't publish a height limit for the graphics card, so height isn't checked until we measure it.
The card sits on a riser behind the motherboard (sandwich layout); the top chamber takes a 240 mm radiator up to 55 mm thick with fans.

This card in other small cases

The card’s size, and all 25 cases

Other RTX 5080 cards in the A4-H2O

Check another pair with the fit checker.

Based on published dimensions, not a guarantee. Check cable, cooler and connector clearance before you buy.