[header] How to buy a video card for your pc [title] Decide on what you want out of a new video card. [step] Multiple monitor displays and fhd or htpc video do not require a high amount of power. For 4 k displays you may need a newer card that supports hdmi 2.0. 
High-end games, demanding emulators, high resolution video and virtual reality may require extra power for optimal performance. You will need to determine how powerful you want your video card's components to be.