ok this time i am teaching myself how to upgrade a media center computer. it didnt come with a HDMI output and i want one to connect my home theater. so i bought a HD4350 ATI RADEON graphics card. to go in my hp pavillion a1630. 1.93 RAM the cards manual says i need at least 400watts of power. how big of a power supply should i get? i dont play video games at all. this is just for movies and internet surfing. thank you o swami's!