I'm buying a new video card and I would like to know how many watts or voltage or w/e my computer has?

open your case and look at the sticker on your power supply.|||You can find that information and almost any other information about your computer by going to the start menu, going to the list of files and programs, and clicking accessories. After your list of accessories is showing go down to the folder marked system tools. Open that folder then click on System Information. Click on the Hardware section and it should list your video card and other information about it such as voltage, company who made it, etc. Hope this helps.