When sourcing ATX gaming cases, prioritize motherboard compatibility (ensure support for Standard ATX, Micro-ATX, and Mini-ITX). Key physical dimensions must include GPU clearance (typically >330mm for high-end cards) and CPU cooler height (at least 160mm). For performance, verify the airflow design, specifically the number of supported 120mm/140mm fan mounts and liquid cooling radiator support (240mm or 360mm at the front/top). Material quality is vital; look for SPCC steel thickness of at least 0.5mm to 0.8mm and tempered glass side panels with a thickness of 4mm for durability and premium aesthetics.