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You don't gain any additional power by having 3D off. It is always producing two 400 x 240 images that are projected to two eyes. That basically means it is using the same amount of power no matter if 3D is on or not.
That said there's still reason to remove the 3D effect. Though depends on the game itself.
IGN stated in an article that by not double-rendering the game for 3D you would get a bit more processing power for graphics or w/e you wanted to.
Not changing this sig until the the CoD:MW2 cliff hanger is relieved (IE Makarov dies) Gamertag: one2many104; Currently playing: CoD:MW2