Some figures from Overclockers (raw estimates):
"If we have a 256MB module made with 256 Mbit DDR333 Infineon chips, it is going to need (8*285 mA) 2280 mA per stick of DDR333. That's over 2 Amps!! If we put 4 sticks in we now need 9120 mA of current at 2.5 Volts to drive them all. That's 22.8 Watts of power. "
http://www.overclockers.com/articles696/
Remember, it depends on voltage, current draw and number of chips.
How much heat does each DIMM of RAM produced?
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