Yup. That's it.
And you can force full precision, as well. This over-rides Nvidia's "optimizations", and should give you higher quality than is achievable otherwise; some Nvidia optimizations cannot be turned off in the driver control panel.
Very useful for older games that have suddenly developed a "bug" with new Nvidia drivers, due to an optimization in a new game being applied (incorrectly) to an old game. Can also fix some crashes, for the exact same reason; optimizations for one game can end up crashing out another game.
Probably won't have a tremendous impact for Radeon users, but even they benefit from the reduced precision on many Directx9/ARB2 calls.
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