450watt psu for 7600gt?

For two GeForce 7600 GT-based graphics cards running in NVIDIA SLI configurations, a minimum 400W PCI Express compliant system power supply (with 12V rating of 24A) is recommended
 
450 is plenty, the question is.. how much amperage is on the 12v. if it has atleast 18 I imagine it would suffice for one single GPU.
 
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