Seasonic M12II 620 or 520 for this system?

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Titan
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May 18, 2007
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You probably won't even hit 300W with that setup, 520W would be vastly sufficient.

With modern GPUs and CPUs being increasingly more power-efficient, the only way to need more than 400W (without going into ridiculous "just because I can" things) is go SLI/CF. As long as you have no plan for that, a high quality 400W PSU would be enough.
 
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Rogue Leader

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No he wouldn't. Neither the 1070 nor the 6700k would cause any sort of jump in power to warrant that. In fact they would likely run the same power as his setup now (~400w tops).
 
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khaleel9ib

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according to outervision calculator i will get around 350W
so i can get one of those:
SeaSonic 430W 80+ Bronze S12II-430
SeaSonic 430W 80+ Bronze ECO-430
 
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Rogue Leader

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You definitely could. Personally I would get the 520 for a little more just in case to make sure you are always working in the middle range of the PSU. As you get closer to its limit it may run hotter, which means the fan spins faster and it could be louder.
 
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Titan
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Even that figure is inflated by about 50W and CPU+GPU peaks rarely happen at the same time, so typical power would be even lower.

That's one of my major pet peeves with the PSU manufacturers and "common wisdom" which keep pushing higher power ratings instead of higher quality and efficiency at lower power. It is easier to achieve high efficiency and better quality at lower power but most of the market is focusing entirely on completely unnecessary overkill 500+W units in an age where even high-end single-GPU rigs only use ~400W. (Ex.: Anand's GPU test system uses an i7-4960X overclocked to 4.2GHz and the whole system including PSU losses used 458W while running FurMark on a GTX1080 while game benchmarks barely break 400W measured at the wall, which means ~370W at the PSU's outputs.)
 
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turkey3_scratch

turkey3_scratch

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450W is like the sweet spot for modern day gaming rigs. If there were actually good PSUs below 450W they'd also be most commonly ideal for single GPU modern systems.

Another thing I see a lot of people confuse is average vs peaks. When calculating your power always do average, because peaks can be naturally absorbed since they are not for extended duration and overcurrent protection (or OPP if it's implemented) kick in far beyond the rated amperages and/or wattage of power supplies so there is always headroom for peaks.
 
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Titan
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There are limits to how much you can "average" peaks: peaks cannot exceed the amount of current that would cause the capacitor's ESR, capacitor discharge and current measurement shunt resistance to drop voltage below the under-voltage threshold or cause noise severe enough to disrupt local regulators.

How well the PSU can deal with "averaging power" depends on how beefy the output capacitor bank is. Make it too beefy though, and you'll vaporize wires when things short out. In cheap PSUs, the output bank is typically the bare minimum the manufacturer thinks it can get away with.
 
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