SFFPC.io

Sheet 03 · Clearance

Does it clear?

Set the limits your case allows, enter the size of your graphics card, CPU cooler and power supply form factor, and get a pass, tight or fail with the margin in millimetres for each. You choose how much spare room counts as comfortable.

Sheet
03 / 06
Inputs
mm, form factor
Output
Pass, tight, fail
Margins
Signed mm
Waiting Checking

Enter the sizes below to see whether everything fits.

3.1

Inputs

All in mm
Case limits
mm

Longest card the case lists.

mm

Tallest cooler the case lists.

The largest form factor the case is built for.

Your components
mm

Bracket edge to far end, including any shroud overhang.

mm

Same reference point the case uses.

Comfort
mm

Spare millimetres you want before calling it a pass.

3.2

Test strips

Pass · Tight · Fail
GPU lengthCard vs case limit
Waiting—
Cooler heightCooler vs case limit
Waiting—
Power supplyForm factor envelope

Length, width and height of the chosen form factor are each compared with the bay. See the axis table below.

Waiting—

Component size  Buffer zone  Overshoot

3.3

Power supply, axis by axis

Chosen form factor against the bay (mm)
AxisPartBayMarginResult
Length———Waiting

The bay is defined by the form factor envelope, so the PSU result ignores the safety buffer. Leave separate room for cables behind the unit.

3.4

Envelope reference

Form factor envelopes (mm)
Form factorLWH
SFX12563.5100
SFX-L12563.5130
ATX15086140

Highlighted row is the form factor you selected. An SFX unit fits an SFX-L bay with 30 mm to spare in height, and either fits an ATX bay.

3.5

Reading the result

Where the numbers come from

Case limits come from the case maker's specification for your exact revision. Component sizes come from the card, cooler and power supply data sheets. Margin is limit minus component: positive means room to spare, negative means the part is that many millimetres too big.

Pass means the margin meets your safety buffer. Tight means the part technically fits but leaves less than the buffer, which is where cables, bent connectors and tolerance stack-up bite. Fail means it does not fit. The status is always written out as a word and a symbol, never colour alone.

Choosing a buffer

A buffer of a few millimetres covers measurement rounding. Raise it if the card's power connector faces the end of the bay, because cables need room to bend before they meet the panel. Set it to zero to see raw margins.

What this check does not cover

It compares three single dimensions. It does not check card thickness against slot count, radiator and fan stacks, memory height under a cooler, front I/O cable room, or whether a riser changes the card's position. Those are separate questions for the case's own documentation.

Edge cases

Each measurement is a number between 1 mm and the maximum shown in the message; zero, negative or non-numeric entries produce a message instead of a result, and the verdict pauses until the field is fixed. Cooler height should use the same reference point as the case limit, usually from the motherboard surface to the top of the cooler. If the two sources use different reference points, add the difference to your buffer.