ITX Cases for Compact High-Performance PCs

If you're doing an ITX build and want something that can actually fit a real GPU without fighting for airflow, worth looking at cases with a sliding/adjustable center wall — makes a huge difference vs. fixed-layout minis where you're stuck with whatever clearance they gave you.

Also don't sleep on the all-in-one options (case + AIO + PSU already installed) if you don't want to deal with matching parts and cable routing yourself. Costs a bit more but saves a ton of headache on a first ITX build.

If you want the absolute smallest box possible and don't mind a slightly trickier build, the sandwich-layout cases (GPU mounted behind the board via riser) get you down to like 11L while still fitting a triple-slot card — just know cable/hose routing in those is tight.

I put together a more detailed breakdown of a few options here if it helps: https://ratedbye.com/itx-cases-for-compact-high-performance/