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Benchmark Scores | Faster than yours... I'd bet on it. :) |
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It was, as you said, 'back in teh day' (and Im thinking with crap PSUs...). Never had an issue with voltage sagging on the 12v with a single rail PSU. Never. I buy quality PSUs and/or must be lucky? Did so since 2004 when I really got into things. 
ATX spec is 5% (11.4v to 12.6). So long as it is within that range, your PC should be all good anyway (that is why motherboards/GPUs have their own power delivery area to further smooth things out and step the voltage down etc). Of course, less fluctuation is better as there is less 'stress' on other components, particularly when overclocking at the limits. But the point remains. This isn't a problem to worry about these days regardless if it is a 'true' multi-rail PSU (internals) or just done by OCP (also internally handled).

ATX spec is 5% (11.4v to 12.6). So long as it is within that range, your PC should be all good anyway (that is why motherboards/GPUs have their own power delivery area to further smooth things out and step the voltage down etc). Of course, less fluctuation is better as there is less 'stress' on other components, particularly when overclocking at the limits. But the point remains. This isn't a problem to worry about these days regardless if it is a 'true' multi-rail PSU (internals) or just done by OCP (also internally handled).
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