GPU size classes: from 2-slot to 4-slot era

Fit is a hardware problem that software lists understate.

What changed

Higher TDP boards needed larger coolers. 2.5–3.5 slot cards became normal in the enthusiast segment. Cases written for 2-slot eras quietly fail.

General information, not personalized advice.

Why do new cards not fit old cases?

Coolers grew in length and slot span for power and thermals.

What fails first?

Often length or slot span; sometimes power cable clearance.

Are reference sizes enough?

No. AIB partners change dimensions.

How to check?

Measure card and case; use the case-fit tool as a first pass.

Advice?

Mechanical guide.