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Re: Seasonic X-Series - PC Notes Dec 2010
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Quote Agharta:
Don’t forget that reviews of PC hardware that show power consumption for the whole system are measuring AC input and power supplies are rated for DC output.
So for a system that is measured as using 350W at the wall with a P/S that is 85% efficient at that wattage the P/S is actually outputting 297.5W.
My i5-2500K system as a whole consumes ~100W DC with all 4 cores 100% loaded with Orthos. The CPU alone has a TDP of 95W which helps you to see that TDP often has a loose relationship to real world power consumption which many people don’t appreciate.
So 460W DC is a hell of a lot of power especially if it’s from a top tier company like Seasonic.
Actually, I'd completely forgotten about PSU efficiency during this thread so thanks for reminding me. I feel pretty dumb for forgetting it since it's THE most important thing in the context of this conversation - Martin only mentioned the X-series because they are fanless and hence quiet. The need for cooling only exists because PSUs are not 100% efficient and have alot of wasted power (exhibited as heat) to get rid of........
Anyway, I agree that this means a PSU rated to 460W with an efficiency power-factor of 0.85 will actually be pulling 541W from the AC socket when running at full capacity. Hence, when taking your measurements from the AC socket, you can scale the results down by the respective power factor to establish what power supply you need.
Saying that, in this case I would imagine that Seasonic have managed to get their power factor in the 0.90 to 0.95 territory. If it was only 0.85 then there would be 80W of power to try and dissipate in a hot, enclosed space without a fan (quite a big ask).
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