Hey, I am going to build a new PC this summer because mines kinda getting old and dated. My 9600gt just cant take it anymore. I am seeing more and more lag with each new release. So, my new card which shall remain nameless requires 600 Watts. Now, I may plan on SLI. If I were to SLI 2 or 3 way how big of a power supply would I need since the 600W required obviously wouldnt handle that.