Without a graphics card, your monitor or TV wonâ€t be able to display anything. Everything will be blank. A system needs some mandatory components to be able to run. A GPU is also the same whether it is an HTPC, a gaming PC, or an LED TV. Many processors have integrated graphics through which a system can be run. But if not, you will have to a graphics card. Graphics card, of course, matters the most for watching movies or playing games.