The GPU clearance number on a PC case listing is measured with the front fan mount completely empty, and that's rarely how the case actually ships in a real build. If you've installed a front radiator and found your "fits a 400mm GPU" case suddenly doesn't, the published clearance figure was never measured with your configuration in mind.
Two Very Different Numbers, One Label
Manufacturers publish a maximum GPU clearance figure for their cases, and that number is almost always measured with nothing mounted in the front fan or radiator position. Once you install a front-mounted radiator and its fans, the assembly can take a real chunk out of that available depth, in some cases 55 to 65mm or more, since the radiator and its fans typically sit directly in front of where a graphics card would otherwise have clear space to extend.
That means a case advertised as fitting a large flagship GPU with room to spare can become a genuinely tight fit, or simply not work at all, the moment you add a front radiator for CPU cooling. This is one of the most common causes of a returned case or a returned graphics card, and it happens because the two clearance figures, empty case versus radiator-equipped case, are rarely both published side by side.
Why This Is So Easy to Miss
The empty-case clearance number is the one that appears prominently in spec sheets and marketing copy, since it's the larger, more impressive figure. The reduced clearance with a front radiator installed requires the manufacturer to test and publish a second number specifically for that configuration, and most don't bother, leaving buyers to discover the real figure only after their parts arrive.
If you're planning an all-air-cooled build with no front radiator, the standard published clearance figure is accurate for your case. The problem is specific to builds combining a large graphics card with front-mounted liquid cooling, which describes a large share of high-end gaming builds today.
What to Actually Check Before Buying
Look specifically for a manufacturer-published clearance figure that accounts for a front radiator and fans installed, not just the empty-case maximum. If that second figure isn't published, treat the empty-case number as optimistic and budget at least 55 to 65mm of additional clearance loss if you're planning a front radiator, especially with thicker fans in a push-pull configuration. And measure your specific graphics card's actual length rather than assuming a "compact" or "shorter" model automatically clears a tight case.
Winner
If your build includes a front-mounted radiator, never rely on a case's empty-chassis GPU clearance figure alone. Look specifically for a radiator-equipped clearance number, and if the manufacturer doesn't publish one, subtract a meaningful safety margin from the headline figure before assuming your graphics card will fit.
Pros and Cons
Empty-case clearance figures: Accurate for air-cooled builds with no front radiator, but significantly overstate the real available space for anyone planning front-mounted liquid cooling.
Radiator-equipped clearance figures: The number that actually matters for a large share of high-end builds, but published far less consistently across manufacturers than the standard maximum.
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