Overview
- In August 2026 Noctua hand‑measured more than 100 popular PC cases and found 56 models with meaningful differences versus the manufacturers' published cooler‑height figures.
- Measured errors ranged from about −3.5 millimeters to +10 millimeters, with examples including the Corsair Frame 4000D measuring 10mm taller than listed and the Lian Li B4‑mATX measuring 3.5mm shorter.
- Noctua has launched and is maintaining a public compatibility database that lists its verified cooler clearances and marks cases where its measurements deviate from official specs.
- Noctua says many makers publish conservative heights to allow for manufacturing tolerances and to prevent side‑panel bulging, but those buffers can either hide fitting problems or cause builders to forgo larger, higher‑performing coolers.
- The tool covers CPU cooler height only, so builders should still measure cases or verify other clearances such as GPU and PSU space before buying to avoid returns or failed builds.