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.
[i]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.[/i]
Nothing like 4 18A 12V rails for some power, right?