ITX: Size: 26*22*18cm Motherboard length limit: ≤18cm Motherboard width limit: ≤18cm CPU air cooling height: no limit Water cooling support: 120 water cooling Hard disk support: 1* mechanical hard disk, 1* solid state hard disk. Graphics card vertical installation: CPU water cooling support MINI MATX: Size: 28*24*20cm Motherboard length limit: ≤25cm Motherboard width limit: ≤18cm CPU air cooling height: no limit Water cooling support: 120, 240 Hard disk support: 2* mechanical hard disk, 2* solid state hard disk. Graphics card vertical installation: CPU water cooling support MATX: Size: 30*28*20cm Support motherboard type: ITX, UMATX, MATX Motherboard length limit: ≤25cm Motherboard width limit: ≤25cm CPU air cooling height: no limit Water cooling support: 120, 240 Hard disk support: 2* mechanical hard disk, 2* solid state hard disk. Graphics card vertical installation: CPU water cooling support ATX: Size: 36*30*20cm Support motherboard types: ITX, UMATX, MATX, ATX Motherboard length limit: ≤30cm Motherboard width limit: ≤25cm CPU air cooling height: no limit Water cooling support: 120, 240, 360 Hard disk support: 2* mechanical hard disk, 2* solid state hard disk. Graphics card vertical installation: suppor Packaging inlcude: 1 set case frame, 5* cable ties, 4* anti-vibration pads, 2* metal switches, 1 set screws, 1 set wrench, 1 set* tool box, 1* graphics card bracket, 1* manual Note: 1. .The computer case frame needs to be installed by yourself. 2.There might be a little error of the size for manual measurement. The PC case frame supports horizontal installation of graphics cards by default. If need to install graphics cards vertically, you need to purchase additional extension cables