Sadly, energy efficiency is NOT the top priority of PC graphics chipset makers.. the number or WATTS graphics cards currently eat up rose since the mid 1990s from 10 or so watts to about 300 for the worst of the high-end monsters. BTW, top performance don't necessarily equal with the highest WATTAGE consumption with the BEST performing card either.. some cards were just lousy designs and ran super HOT and inefficient power-wise.
The places where we could see MORE energy efficiency is in CPUs and MOTHERBOARDS and PC GPU's. Some day SSD's will make their way into mainstream.
Intel would like us to think that they have viable tablet R&D.. however, other companies are ones reaping the rewards.. perhaps the tablet industry knows once intel gets their hooks into an industry, they will try to price gouge as they do in the CPU industry so much that AMD is a shadow of it's former 1990s self.