Stephen. Im pretty shure you are wrong on this one.
All where i look ive seen less wattage with cooler chips. The GTX480 was extreme in this sence and even watercooling it vs aircooling would decrease the wattage by quite an amount. Also ask the Ln2 guys, i think it was Chew* that stated that even with 2v on the cpu it didnt really put out more wattage than on stock voltage and roomtemp.