Chapter 2 Installation 2. How to remove PCI slot 1. How to install 5.25” and 3.5” Drives A. 5.25” device and 3.5”floppy/card reader Lock 3. How to install side fan (ECA3175-L/ECA3175-S) B. 3.5” HDD Unlock Note Suggested height of CPU cooler and length of VGA card 4. Cable connection description On some motherboards, the connectors are not the same as the drawing below. Please check with your motherboard manual before installing. 166 mm USB3.