Upgrade questions

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I currently am running a PhenomII Deneb 2.8quad with 8gb ddr3. With a 6970 and a gigabyte 790 bridge mobo.. I am wanting to upgrade my Cpu, Mobo, and PSU to be more energy efficient, for personal reasons. And I was wondering what would be my best choices. And if I should get a nvidia 670 as well. If it'd be worth it.

 

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How much higher efficiency do you need?

The best way to do that is get lower powered hardware to begin with - like a dual core CPU and integrated graphics.
Maybe even a notebook?