When sourcing gaming cases, you must prioritize thermal management and structural compatibility. Ensure the case supports the specific motherboard form factor (E-ATX, ATX, Micro-ATX, or ITX). For high-end builds, verify the maximum GPU length (typically >350mm) and CPU cooler height clearance (typically >160mm). Additionally, look for cases with optimized airflow designs, such as mesh front panels and support for multiple 120mm/140mm fans or liquid cooling radiators (240mm, 280mm, or 360mm) to prevent hardware throttling.