A serious PC isn’t quite so serious without a graphics card. These come in a variety of sizes and flavors but the mounting is always the same We might first decide which PCI slot it will be connected to. By default choose the one at the top, closest to the processor. Then remove the corresponding I/O plates from the case. Always hold the card with two hands so it doesn’t slip. Vertically insert the PCI connector into the PCI slot gently. If you are align properly it should just fit and automatically lock into the slot. Finally we must secure the card with the required screws at the back of the chasis. In addition to the PCI slot lock these screws play a crucial role to secure the card. Pro Tip: Some high-end cards are longer or use even more PCI space Make sure to check that beforehand to choose the appropriate case.