1、Applicable Motherboard Specifications: Computer open case supports all standard ATX, MATX,for FLEX motherboards with adapter cables, maximum motherboard size 305 x 245mm. 2、Powerful Expandability: This computer open chassis supports unlimited length graphics card installation, short graphics card mounting bracket for all lengths of GPU graphics cards. 3、Ensure Efficient Cooling: The front of the computer open chassis rack features four lockable 12cm/4.7in fan positions to ensure the cooling effect of the graphics card. 4、Multi Functional: Maximum 8 graphics cards can be installed, supports ATX single power supply, 4 12x12x2.5cm / 4.7x4.7x1in fan spaces can be installed, and 1 SSD and 1 HDD hard disk are supported at the same time. 5、Stable And Reliable: DIY computer case is made of sturdy steel plate material, high hardness, not easy to deform, long service life, supports for Great Wall 1250 and other ATX power supply.