What is the format of the "time" field that is present in the JSON output (root level field)? For instance, a recently captured time value yields the number 1311642616.9349999.
it is unix time (seconds since the epoch)
I will not implement support for the fan speed curve any time soon, sorry. I will take a look at why fan control is not working for the xx70 cards, though. probably it is because there is no rpm reading.