GPU Length Clearance Checker | Mini-ITX Case Compatibility Tool

GPU Length Clearance & Case Compatibility Checker

Case rated clearance
330mm
Real usable clearance
310mm
Real clearance is an estimate based on typical fan bracket and dust filter thickness, not your exact case's engineering spec. Confirm against your case manufacturer's documentation for a build you can't easily return.

Why A Case’s Rated GPU Length Is Measured On An Empty Chassis

A maximum GPU length is listed on the spec sheet of every mini-ITX and small-form-factor case, and it is nearly always measured on an empty, bare chassis without any radiators, front fans, or dust filters. Depending on fan thickness and bracket design, that clearance decreases as soon as front intake fans are installed, sometimes by as little as a centimeter and other times by three or four. This is the most frequent explanation for why someone purchases a card that “should fit” based on the case’s specification sheet only to discover that it collides with an installed fan during construction.

This checker adjusts the case’s rated clearance based on your actual front fan configuration, so the number you’re checking your GPU against reflects the case as you’re actually going to build it, not the case as it shipped in the box.

Reading The Results And What Margin Actually Means

A negative margin indicates that the card will not physically fit with the fan setup as it is configured. A shorter card, fewer or thinner front fans, or a different case are possible solutions. The card’s power connector cables at the front, which frequently require their own clearance to bend without kinking against the fans or a dust filter, technically fit with a tiny positive margin of less than 10mm. Anything more than 10 mm of margin allows air to flow around the card’s shroud instead of being choked off at the intake and provides comfortable space for cables.

How you set up your fans is more important than most people think. The biggest thing that takes up space in this calculator is a front radiator on an all-in-one liquid cooler, especially when it’s between 25 and 45mm thick with fans and mounting hardware added. A single slim 25mm fan barely affects clearance. If you want to fit both a long GPU and a front-mounted AIO in a small case, check this measurement before you buy either part. That way, you can make sure they won’t be competing for the same few millimeters of space.

Frequently Asked Questions

Does a case’s max GPU length include front fans?
No. Most case manufacturers use an empty chassis with no radiator, filter, or front fans to measure the maximum GPU length. Depending on fan thickness and bracket design, usable clearance usually decreases by 10 to 35 mm after adding front intake fans.

How much GPU clearance do I lose with an AIO radiator?
The largest clearance loss in a small case is usually caused by a front-mounted AIO radiator, which reduces the usable GPU length by 25 to 45 mm relative to the case’s empty-chassis rating once fans and mounting hardware are stacked together.

What happens if my GPU is too long for my case?
The card physically won’t seat, either colliding with front fans, a radiator, or the case’s front panel itself. The fix is a shorter card, removing or relocating front fans, or a different case, since forcing an oversized card in risks bending the PCIe slot or damaging the card’s fan shroud.

How much clearance margin should I leave for a GPU in a small case?
Since the card’s power connector cables must have space to bend at the front without kinking against a fan or filter, it is reasonable to leave at least 10mm of margin beyond the card’s raw length. Better airflow around the shroud itself is another benefit of having more margin.

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