There is more going on here than just a thermostat. -The SoC contains an (up to) 1Ghz ARM Cortex-A8 -64MB of SDRAM -Micro NAND flash IC (can't tell the size)

There is more going on here than just a thermostat. -The SoC contains an (up to) 1Ghz ARM Cortex-A8 -64MB of SDRAM -Micro NAND flash IC (can't tell the size) -Separate Texas Instruments ZigBee SoC with a 8051 micro-controller and hardware ZigBee acceleration -Texas Instruments 2.4ghz front end for the zigbee SoC, looks to be used as a power amp. Given that the SoC has a decent transceiver built in, they are after serious range. This is massive overkill for what the device does today, seems more likely this devices is intended to be the "head unit" for a network of many other ZigBee devices.