(1) Classification

SizeSupported MotherboardUsage
ITX CaseMini-ITXCompact, portable PC
MATX CaseMicro-ATXGeneral use, mid-tower
ATX CaseATXGaming, mainstream tower
E-ATX CaseE-ATXWorkstations, high-end builds

(2) Classification Reasons

  • Size affects cooling and expandability (ITX cases have limited airflow).
  • ATX cases support more PCIe slots and better cooling solutions.