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R_1 · Dec 28, 2011, 09:24 AM

Tablet SoC-s are miliwatt parts, not 2.5 watt ones, especially when playing video. If iPad-s A5 was a 2.5watt SoC, then (2.5watt SoC+ 2 watt LCD&rest) x 10 hour = 45 watt-hour battery. iPad 2 battery is 24.8 watt-hour, that means A5 has 450 miliwatt power consumption, when playing video. Numbers are even a bit down, because iPad-s real battery life for video playing is longer than 10 hour and that playing time can be achieved even with Wi-Fi streaming video, so some DSP is kicking , adding streaming optimizations and A5 consumption is getting lower to accommodate additional Wi-Fi power. Basically a 5 watt tablet will have ~3 hour battery life at best. Some aditional info about iGPU power consumption will be needed too, because OS GUI and Internet browsing are hardware accelerated.
"2.6 W in idle" - too bad, if that is real.

Dec 28, 2011, 09:24 AM	#15
R_1 Join Date: Nov 2006 Posts: 449 (0.19/day) Thanks: 4 Thanked 39 Times in 26 Posts	Tablet SoC-s are miliwatt parts, not 2.5 watt ones, especially when playing video. If iPad-s A5 was a 2.5watt SoC, then (2.5watt SoC+ 2 watt LCD&rest) x 10 hour = 45 watt-hour battery. iPad 2 battery is 24.8 watt-hour, that means A5 has 450 miliwatt power consumption, when playing video. Numbers are even a bit down, because iPad-s real battery life for video playing is longer than 10 hour and that playing time can be achieved even with Wi-Fi streaming video, so some DSP is kicking , adding streaming optimizations and A5 consumption is getting lower to accommodate additional Wi-Fi power. Basically a 5 watt tablet will have ~3 hour battery life at best. Some aditional info about iGPU power consumption will be needed too, because OS GUI and Internet browsing are hardware accelerated. "2.6 W in idle" - too bad, if that is real. Last edited by R_1; Dec 28, 2011 at 09:31 AM.