
Originally Posted by
tetrisGOAT
Assuming CPU is overclocked at 4.6MHz, four 7200RPM and an ODD and SSD, but GPUs would run non-overclocked (which I know you don't run, but for the sake of you adding the calculation of the overclocks), you're now pulling 450w at realistic load (f@h or gaming). Benchmark loading is 496w.
The same figures with a second GTX 560 Ti would be 571w and 629w. I'd say, with overclocks, you'd still be safe. Albeit, dual cards don't clock as well.
Going overkill on the PSU is a bad thing. For one thing, its life expectancy goes down as it ages faster ~50% load compared to 75%, meaning you'd suffer more from capacitator aging. Meaning, efficiency goes down. :P