In a technical blog post, Noctua reveals that it has been physically hand-measuring over 100 popular PC cases in-house. What the team discovered is that case manufacturers frequently underreport actual CPU cooler clearance, causing builders to settle for smaller, less capable heatsinks than their chassis can actually accommodate. For example, NZXT lists 75mm of cooler clearance for its H2 Flow chassis, but Noctua measured it at 79mm. According to Thermaltake, that chassis offers 68mm of cooler clearance, but Noctua's measurements showed 70.7mm. ASUS lists that case with 170mm of cooler clearance, whereas Noctua found it to be 168.3mm.