For some people, a 750W power supply is necessary. PC Perspective takes Silverstone's beastly unit through the paces to see if it's worthy for that SLI or Crossfire box. So why then you might ask, would we need a 750W power supply? For one thing a power supply should ideally be rated for approximately twice the expected maximum load. If your PC will use between 150~200 watts of DC power then the PSU should be rated for at least 350~400 watts. This will allow the power supply to operate at around 50% of its rated capacity. But if you are a gamer with one or more high-end video cards, then you will definitely need a high-quality, larger capacity power supply! For example: BFG Tech recommends using a power supply that can deliver a minimum 26A +12V with their GeForce 7800/7900 video cards. If you have two GeForce 7800/7900’s in SLI mode, then a minimum rating of 34A +12V is recommended. That’s over 400 watts for just the two video cards. Nothing like 4 18A 12V rails for some power, right?
