SLI power req

Celegorm

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we all know that SLI or crossfire setups need extra power, but how much is truely enough?

is there an equation to it? like take 1.5 and multiply it by the power reqs for a single card?

using an NVIDIA 8800 GTS for an example (it needs 400 watts) would i do 400*1.5 = 600? meaning i would need 600 watts to fully run the cards? or is it jsut get as big of a psu as you and afford?
 
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