I'm doing some fact-checking on this. I've read up on the topic lately and want to "compare notes," so to speak. This is specifically regarding computer components, CPU and memory in particular. So without further ado:
Overvolting: Running a component at a higher voltage than rated.
Undervolting: Running a component at a lower voltage than rated.
Effects of overvolting: Potential increase in stability, particularly when overclocking. Increased power draw and heat generation, requiring better cooling and potentially reducing life expectancy.
Effects of undervolting: Potential decrease in stability. Decreased power draw and heat generation.
Necessity of overvolting: When overclocking a component, it might end up unstable unless voltage is increased to compensate.
Necessity of undervolting: Any?
I've also noticed that modern computers often underclock the CPU when idle, and it seems like my computer also undervolts it at the same time. I assume this is a power-saving feature, and normal behaviour.
Finally, I wonder if undervolting the RAM while still running it at the rated clock rate would/could lead to read/write errors? What about the CPU, erroneous calculations I presume?
I'm trying to educate myself on the topic, but I'm afraid that there's still a lot of superstition and "cargo cult" thinking embedded in my knowledge about hardware, so this is an attempt to learn more. If you know anything about the subject and see anything in the above that you can confirm, deny, or elaborate on (or which is just plain stupid and false), do reply.
Military cemeteries around the world are packed with brainwashed, dead soldiers who were convinced God was on their side.
- George Carlin