I'm building a system based on a Sandbridge cpu with H67 chipset that will only use the onboard video. Other than that it will have only a cd drive and one HD. After checking different power calculator the average requirement is about 280w. But I'd like have have headroom to add a high end video card (with TDP of about 200w) in the future which raises the power requirement to near 500w. So I think I should buy a 500w PSU to be ready for a video upgrade.
My concern is that the system with onboard video is consuming (from what I've read) about 60w at idle which is only about 12% of the capacity of the PSU. I've also read that it's better to run PSUs in their efficiency zone of 20%-80% of their capacity. Will this reduce the life of the PSU to run it at only 10-12% of its capacity? And how mush efficiency loss can I expect?
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