The Z-60 has a 4.5W thermal envelope, down from 5.9W on the Z-01. AMD claims the Z-60 consumes just 1.57W while playing HD video, 1.12W when web browsing, and 0.75W at idle.
That's just the processor, not the system power consumption. Expect it to be quite a bit higher due to the FCH, SATA, etc., all adding mW to the overall draw. It's why SoCs are favored in small form factor designs. They're also quite a bit cheaper and allow smaller PCBs, meaning more room for other components and a bigger battery.
