Originally Posted by michael-ocn
Originally Posted by zooterboy
I never have and never will use sleep mode. The entire principle of it is flawed, and I am not in such a hurry that I can't wait an extra 30 seconds to boot up. Nothing saves more power than shutting down.
I'll have to look into how much power is consumed while the system is sleeping. If wake/sleep cycles are frequent enough, power spent by running the full shutdown/boot sequence might exceed power consumed while sleeping in between. Then there's all the "we just booted" logic that runs and consumes more cpu/disk/power shortly after having booted up that doesn't occur after waking up.
So i did some looking into this.
* a sleeping system uses very little power, ~4 watts
* a system thats shutdown, but still plugged in, consumes about 1 watt
* a decent rig at idle, ~125 watts
* lets say a decent rig at work but not full load (like when booting), ~200 watts
Assuming you don't unplug from the wall while shutdown (which would cause the mobos battery to drain faster), a sleeping system consumes 3 watts more than a shutdown system. In rough napkin math terms, 1 minute of boot time power consumption is roughly equal to 60 minutes of sleep time power consumption.
I usually sleep/wake my system multiple times a day, sometimes with windows open at the time of sleep so i don't lose where i was or what i was doing when i come back. If sleep weren't an option, i'm not sure what i'd for those cases. Probably, I'd not shutdown as often as i put it to sleep?
Ok... not the most rigorous analysis, but i think its not a slam dunk that shutdown will always win out in terms of lower power consumption. The extra power spent while shutting down and booting does add up pretty fast... but the whopping difference is probably in changes of habits that end up leaving the system on instead of asleep.