With each new generation of high-end video cards the demand for power just keeps growing. Not only does the separate video cards need more power, using two in SLI or Crossfire mode increases the power demand even more. It is of course possible to just buy a new more powerful PSU every time you upgrade but that is not always practical, especially if you have a PSU that you are happy with and do not want to have to replace.
With the release of the GeForce 8 cards from NVIDIA and R600 from AMD we also have another problem. While two PCI-Express power cables were enough to power two previous generation video cards in SLI or Crossfire, we now need 4(!) cables if we happen to be able to afford a second GeForce 8800GTX or R600.
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