Caporegime
Yes, it boost all the way until it hits thermal limits or whatever power input limit is set.
Yep and that is why one card will differ to another card and another card. It is frankly impossible to monitor clocks on a 6/7 series card unless you mod the bios to disable the boost function. The clocks fluctuate the whole time and can be at 1060Mhz at one time and then down to 980Mhz another time.