Noctua Hand-Measured Over 100 PC Cases and Found Clearance Specs Often Wrong

Austrian cooling specialist Noctua has discovered that official PC case specifications often do not match reality. The company manually measured CPU cooler clearance in more than a hundred cases from various vendors and compiled a public database showing which coolers actually fit inside.

The usual way to check compatibility is to review the specifications on the product page. Nearly all manufacturers list maximum cooler height there, along with clearance for graphics cards and power supplies. However, as practice shows, this data cannot be fully trusted: in some cases, a cooler presses against the side panel even though the documentation promises sufficient clearance. In others, a taller cooler can actually be installed, but there is no way to know without physically building the system.

Noctua addressed this by creating a database with results from its own measurements. For each case, the company prepared compatibility tables for its coolers. For example, popular models like the Corsair 4000D, 5000D, and 5000X offer nearly 10 mm more clearance than advertised, allowing the flagship NH-D15 G2, which is 168 mm tall, to fit with ample room to spare.

There are also opposite examples. In the ASUS Prime AP201, the real clearance is about 2 mm less than the manufacturer claims. This could come as an unpleasant surprise when buying large air cooling.

The database is tailored to Noctua coolers, but the company says it can also be used to gauge compatibility with products from other brands. Noctua plans to keep expanding the list of cases, continuing manual measurements of new models.