Intel P965 is heavy on the juice.
http://www.theinquirer.net/?article=32230
North Bridge 975X 945P P965
South Bridge ICH7 ICH7 ICH8
Bus Speed 1066MHz 1066MHz 1066MHz
Memory 667 x 2 667 x 2 ICH8
NB TDP 13.5W 15.2W 19W
SB TDP 3.3W 3.3W 4.1W
Total TDP 16.8W 18.5W 23.1W
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No idea how this might effect its overclock but maybe something to consider.