How to install a graphics card into your Windows PC and upgrade its performance Dave JohnsonFeb 2, 2021, 03:48 IST Updating your PC's graphics card is important for the best visual experience, especially for desktop gaming.Giuseppe Manfra/Getty Images To install a PC, you'll need to open its case and replace your existing card. The graphics card needs to be installed into the PCI Express slot, and then connected to a power source. Before you buy a new graphics card, make sure that your new card is compatible with your computer's case, CPU, and power supply. Of all the components in a computer, your graphics card becomes outdated the fastest. New graphics cards are released every year, each one boasting more power and features than the last.