For our temperature testing, we measure the peak GPU core temperature under load, as well as the GPU temperature with the card idling on the desktop. A reading under load comes from running the 3DMark Fire Strike Ultra stress test 20 times. An idle reading comes after leaving the system on the Windows desktop for 30 minutes.
As for noise levels, the Lightning Z is generally pretty inoffensive. It's not the absolute quietest card I've ever tested, but it is still far from loud. In any case, I think it is safe to say this card is targeting the user looking for all-out performance, instead of ultra low noise levels, and even then – like I said – the Lightning Z is still not loud.