Decide your real size class first
Compact is a marketing umbrella covering compact ATX mid-towers, ~20–30L mATX minis, cubes, and sub-20L ultra-small shells. An NZXT H5 Flow and a Zalman CUBIX are not solving the same desk problem. Measure the shelf, knee space, and cable grommet path before you shop.
If you already own an ATX motherboard, do not force a Micro-ATX-only case. If you are buying a new board anyway, mATX often gives the best balance of features and case choice in this pack.
GPU length is the make-or-break number
Modern graphics cards vary wildly in length and thickness. Always compare the card’s published length—including power connector overhang—to the case limit, then subtract radiator thickness if a front AIO shares that tunnel.
In this pack, Lian Li’s V100 Mini and A3 Wood lead long-card flexibility. Zalman CUBIX and CUBIX-G demand shorter GPUs. Mid options like JONSBO D32, Z20, MOROVOL V3, Cooler Master Q300L, and DARKROCK EC2 sit between those poles.
Cooler and radiator limits shrink faster than the exterior
Small cases often keep trays close to side panels and roofs, which is why cooler heights around 137–164mm and 240mm radiator caps appear even when a mid-tower sibling offers 360mm everywhere. Read exceptions carefully: the V100 Mini supports 360mm but not 280mm AIOs, while the H5 Flow and EC2 lean on front 360mm support.
If you love tall dual-tower air coolers, verify height before falling for panoramic glass. Liquid cooling can reclaim headroom only if tube routing clears RAM and VRM heatsinks.
Fans included versus fans budgeted
Pre-installed fans change day-one thermals. The V100 Mini’s four ARGB PWM fans and Zalman/MOROVOL bundles feel complete. The Lian Li A3 Wood and DARKROCK EC2 expect you to finish the airflow plan. Neither approach is wrong; mixing them up in a spreadsheet is.
In tight cases, fan quality matters as much as fan count. A noisy 80mm or cheap dense stack can make a small PC feel louder than a larger tower with slower fans.
Dust, I/O, and living with a small PC
Mesh and perforated compact cases need filter discipline. Magnetic top and bottom filters on several models here are maintenance tools, not cosmetics. USB-C on the front panel is increasingly the difference between daily convenience and a permanent rear-I/O dongle.
Plan cable volume too. SFX PSUs free space but are not mandatory when a case allows short ATX units. Leave service clearance so you can replace an SSD later without dismantling a panoramic glass sandwich.