WP34s Power Proc-Speed Performance

[matthiaspaul]

(02-13-2015 10:54 PM)MarkHaysHarris777 Wrote:  So, the lesson here is that you will literally cut your power consumption in half ( delta of -53.8 % <decrease> ) by setting your proc frequency to 'SLOW' prior to long loops, data transfers, or updates.

But you basically won't gain anything in regard to the needed energy, since you need twice the time (ignoring some chemical processes inside the battery, which differ depending on the load)... ;-)

FWIW the observed trade-off of speed versus current is what can be expected from a processor manufactured in CMOS (complementary metal-oxide semiconductor) technology. One characteristic of this technology is that a cell consisting of two complementary MOSFETs draws measureable power only in state transitions, whereas in the static phases between these transitions, either one or the other transistor is always off (and the complementary one always on, respectively), so that no current can flow from supply to ground except for in those moments of state transition. So, the power consumption is a linear function of clock frequency - down to virtually zero when the clock is off.

Greetings,

Matthias

EDIT: For easier reference more threads on similar topics:

http://www.hpmuseum.org/forum/thread-3453.html
http://www.hpmuseum.org/forum/thread-3336.html
http://www.hpmuseum.org/forum/thread-3077.html