On Fri, Jul 19, 2024 at 03:21:40PM -0400, Scott Allen wrote:
On Fri, 19 Jul 2024 at 10:56, Lennart Sorensen via talk <talk@gtalug.org> wrote: I recently bought a Cooler Master Masterwatt Lite 600, model MPX-6001-ACAAW, PC power supply, circa 2017. (I got it from a guy for $25 who bought it new, because he thought the supply in his PC was faulty. It turned out his original supply was fine, so this one had sat in the box unused.)
The product sheet for this supply says: "Cooler Master's 120mm HDB temperature control fan"... (Note "temperature control") https://www.coolermaster.com/en-global/products/masterwatt-lite-600w-full-ra...
The box it came in has a graph with curves for fan RPM and acoustic noise (dBA) on the Y axis vs. percent of rated load on the X axis. From 0% to 100% load the fan speed slopes upwards from 1000 to 2000 RPM (and the noise from 20 to 34 dBA).
Having a temperature controlled fan in a PC power supply didn't strike me as being unusual.
Well maybe at the higher wattages. I haven't built anything that ever need that much power (high end gaming machines is not something I have ever had).
This, however, is likely almost alway true. I think the control range would rarely extend to fully off.
Yeah 1000 rpm is definitely still spinning just much less noisy. I suspect there are some specialized silent power supplies that may in fact stop their fan when not needed.
I believe this supply is considered to be a "budget" model. https://www.pctekreviews.com/Reviews/PSU_600.aspx
At what point did 600W power supplies become budget level power supplies? -- Len Sorensen