I've heard I need to check the power supply that graphic cards need to run on. I'm trying to hook my TV to my computer. I never see power requirements in specs. when looking to purchase a card online. How do I look for this? Will I need to ADD the card or REPLACE the existing one. I hear you need more than 1 card to get the most out of TV to computer. Also any thoughts on a card that works w/out spending large $$$. I'm going to add a card with HDMI port. I'll buy the TV once that's done. So I should have a lot of options.--Thanks in advance.