all else being equal, a larger fan moves a lot more air for generally a small increase in power consumption(it's also a LOT more quiet).... this can be more than offset by just driving the fan at a reduced duty cycle(which will likely happen automatically depending on the motherboard), which helps reduce noise even further as well.
Cooler Master Sleeve Bearing 140mm Silent Fan for Computer Cases and Radiators - Newegg.com
good examples there.
displays have come a long way in 12 years in terms of power efficiency.