Will it fit?
Will the RTX 3090 fit in my case?
A typical RTX 3090 is about 313 mm long, 3 slots thick. It fits 11 of the 12 popular cases we track, is tight in 1. Check your exact model's length against the case limit below.
Key facts· updated
- A typical RTX 3090 is about 313 mm long and 3 slots thick (maker spec pages, checked Oct 29, 2026).
- The RTX 3090 fits 11 of the 12 popular cases PC Atlas tracks and is tight in 1 (case maker limits, checked Oct 29, 2026).
- The smallest tracked case that fits the RTX 3090 is the Montech AIR 100, which takes cards up to 330 mm.
| Case | Card limit | Room | Fits? |
|---|---|---|---|
| Montech AIR 100micro-ATX tower | 330 mm | ~17 mm | Yes, most models |
| Lian Li A3-mATXmicro-ATX tower | 415 mm · 4 slots | ~102 mm | Yes |
| Phanteks XT Pro Ultramid tower | 415 mm | ~102 mm | Yes |
| Corsair 4000D Airflowmid tower | 360 mm340 mm with a front radiator | ~47 mm | Yes |
| Lian Li Lancool 216mid tower | 392 mm | ~79 mm | Yes |
| NZXT H6 Flowmid tower | 365 mm | ~52 mm | Yes |
| Fractal Design Northmid tower | 355 mm300 mm with a front radiator | ~42 mm | Yes |
| HYTE Y70mid tower | 422 mm | ~109 mm | Yes |
| Fractal Design Meshify 2 XLfull tower | 524 mm | ~211 mm | Yes |
| Phanteks NV7full tower | 450 mm | ~137 mm | Yes |
| Cooler Master NR200P V2mini-ITX case | 356 mm · 3 slots | ~43 mm | Yes |
| Lian Li A4-H2Omini-ITX case | 322 mm | ~9 mm | Tight |
Case limits from case maker spec pages and card length from typical models (checked 2026-10-29). Room = case limit minus a typical RTX 3090. “Yes, most models” = under 40 mm to spare; “Tight” = under 15 mm. Page updated .
Questions
Will the RTX 3090 fit in my case?
A typical RTX 3090 is about 313 mm long, 3 slots thick. It fits 11 of the 12 popular cases we track, is tight in 1. Check your exact model's length against the case limit below.
How long is the RTX 3090?
About 313 mm for a typical model and 3 slots thick. Big triple-fan versions can be 20 to 40 mm longer, so check your exact model on the maker's spec page.
What's the smallest case that fits the RTX 3090?
Of the cases we track, the Montech AIR 100 (a micro-ATX tower, cards up to 330 mm).
What about a front radiator?
Some cases lose graphics card room when a radiator is mounted in the front. Where a case maker lists the shorter limit, the table shows it in the notes.