I'm building a very low power HTPC. I'd like to make it as efficient as possible. The components I've chosen (a low power Atom mobo/CPU, a single SO-DIMM and an SSD) should idle at around 10W if not less.
However, all the PSUs I see list only their efficiency with 20+% load, which is usually much more than that. Benchmarks seem to likewise never measure those very small power draw numbers.
I don't want to pay hundreds to save a tiny bit of power, but are there affordable PSUs that advertise their efficiency at such low loads?
My case has a standard ATX power supply, but some of the smaller form factors might fit too, as long as they have the standard connectors.