Char Jackson wrote:
On Sat, 22 Dec 2018 22:12:46 -0500, Paul wrote:

Jonnyguru.com has power supply reviews, and sometimes
an item you see for sale, has been reviewed, and you
can get additional information before buying.

Regarding PSU sizing, most of what I've read in recent years, (with the
Bronze and Gold etc. labeling), seems to agree that you want the PSU to
be running at about 50% of its rated capacity because it's most
efficient there. Does that sound about right?


The review sites can tell you that, the ones with
the gear to test.

I don't recollect off hand, there being a strong
curve shape for all of them (all alike). It's
a bit of wavey gravy. Numerically, you would not
expect them to be infinitely efficient at low
power output, but if a supply was meeting 87%
at 100W, there is little heat output to be
expected from the supply, so you're still winning
big time.

Paul