Is anything not checked?

Lian Li doesn't publish a height limit for the Q58, so that isn't checked.

Where do these numbers come from?

Lian Li's published spec; card size from NVIDIA'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 Q58

Will it fit

Does the NVIDIA GeForce RTX 5090 Founders Edition fit in the Lian Li Q58?

Fits

Yes. The NVIDIA GeForce RTX 5090 Founders Edition fits the Lian Li Q58 with 16 mm of length to spare.

Length304 of 320 mm16 mm spare

Height137 mmNot published

Thickness2 of 3 slots1 slots spare

Exact measurements

Size	NVIDIA	Q58	Room
Length	304 mm	320 mm	16 mm spare
Height	137 mm	—	Not published
Thickness	2 slots	3 slots	1 slots spare

Lian Li's published spec

Questions

Does the NVIDIA GeForce RTX 5090 Founders Edition fit in the Lian Li Q58?: Yes. The NVIDIA GeForce RTX 5090 Founders Edition fits the Lian Li Q58 with 16 mm of length to spare. Length 304 of 320 mm, height 137 mm (no published limit), thickness 2 of 3 slots.
Is anything not checked?: Lian Li doesn't publish a height limit for the Q58, so that isn't checked.
Where do these numbers come from?: Lian Li's published spec; card size from NVIDIA'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 Q58 specifications, checked October 24, 2026. Lian Li lists a 320 mm length limit and 3-slot cards.
Card: NVIDIA’s spec page, checked October 23, 2026. NVIDIA publishes the slot count, not a thickness in millimetres, and asks for room for a 3-slot (61 mm) card for airflow.
Lian Li says a card close to 320 mm takes some angling to fit in.

This card in other small cases

The card’s size, and all 25 cases

Other RTX 5090 cards in the Q58

Check another pair with the fit checker.

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