The actual GPU’s sensor never goes above 76 degrees centigrade(custom fancurve), but from what I’ve read the VRM(s) can get quite freaking hot (for example on my ASUS GTX670 DirectCU II it goes 80+ daily, but card itself is sub-60).
Official response through support was.. well.. non-existent; it was basically “Ask about airflow, ignore actual questions.”
Then again the VRM-temps seem to have lowered for some reason to sub-90.