Suspend power consumption is dominated by ram refresh. There are hardware differences in ram, lpddr consumes 3 times less than ddr. On an atmel a5 for example suspend to ram with lpddr is 9-15 ma @ 3.3V, with normal ram around 33-40 ma. The Pi Zero is currently at 100 ma (AFAIK). Would be amazing if someone could fix this to 10ma, but i wont hold my breath on this issue. And the newer versions, powerwise, are going in the wrong direction. So if you want to build something in the pi range with power management you might consider something like this http://www.micro-technic.com/Webshop...A5D3X-MT0.html or http://www.emacinc.com/products/syst...dule/SoM-A5D36 lpddr2 seems to be a rare commodity, somewhere i read the DIPFORTy2 "All Programmable Linux" is "delayed", because even 64MB lpddr2 seems hard to get.