Do I need Twice The Amps For SLI?

When you have 2 cards running SLI, does the psu need to have twice the amperage on the 12v rail as a single card would need? To further explain my question, if an evga 9800GTX+ card requires 24amps,would I need 48amps for 2 of these cards in SLI? Or could I get by with like 45amps?
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  1. Let this "do the math" for you

    http://www.antec.outervision.com/
  2. This only told me the wattage, which I know how much I need. However it did not show a result for the 12v rail, at least for me.
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