I just picked out my components (not ordered quite yet) for my new power efficient office/gaming system. It incorperates
Nvidia's hybrid SLI technology to allow very low 2d operating power consumption while still having great 3d gaming performance. Basically, when in 2d mode it uses the onboard video GPU and powers down the video card. When you need to do 3d, it powers on your PCI-e video card (that would otherwise be guzzling down 40-60W all the time) and you get it's benefits. Great idea. This setup will allow my machine to idle well under 100W in 2d mode, yet still allow me to play anything I want game wise. I also went with an 85% efficient PSU and power efficient 45W AMD processor to keep power consumption down.