An inverter, ITPS & dc-dc converter, or Carnetix.
But with your setup, you'll only get good results from an Opus 150w.
I have a P3 with an asus motherboard. Slimline dvd rom. 80 gig harddrive. gps. audigy2 sound card. ati 9000 vid card. 256 ram. 7" tview screen.
I don't want to buy an opus. What is my next alternative. I am putting this thing in soon. I calculated a total of 126 on the wattage calculator everyone's using.