Google’s initial Tango prototypes used special vision processing chips to power the augmented reality experience. That said, the Lenovo Phab 2 Pro — which was announced earlier this month a mere Snapdragon 652 chipset — doesn’t need such a chip: it does all the heavy lifting on its own.
Qualcomm attributes this to their chipsets’ heterogeneous processing, which can put non-computing chips like image and sensor processing to task for general CPU duties. As a result, their chip has enough power — and then some — to handle a full Tango experience. The only extra things a device needs are the depth-sensing cameras.
This combination allows Tango to make full use of device sensors and cameras with less than 10% of the power it takes for a normal app to run. With this explanation, Qualcomm today confirmed that the Snapdragon 820 and higher will support Tango, as well as future 600-series Snapdragon chipsets.