Think Computers take a look at the OCZ Fatal1ty Series 700W PSU, a reasonable power supply for gaming PCs:
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The 12V rail was quite stable, rippling only 0.58%. It did have some spikes toward the beginning and end of the test, but the middle was constant.
Fortunately, none of these lines are overvolting. Hardware is much more resistant to overvolting than being starved by undervolting. Remember that most motherboards can handle a +-5% fluctuation in power, so these < 1% ripples are virtually meaningless when compared against each other. Changes in the power line or even background processes accessing hardware outside of the test could alter the results by that much.
The OCZ Fatal1ty 700W power supply unit is another excellent choice for a midrange gaming build. It provides solid power and isn't going to waver when powering dual video cards.
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Read the review
here.