All else being equal that's usually true though - a 750W model of the same PSU will usually draw more at 75W output than the 650W model of the same PSU. But wit

All else being equal that's usually true though - a 750W model of the same PSU will usually draw more at 75W output than the 650W model of the same PSU. But with 80+ gold and above the difference will be negligible.