I think what xsjado means is that if you get 100 as your HSC mark will your scaled mark (for the UAI) be 100. The answer is no one knows what will happen this year until after people do their HSC because everything is carried out afresh. Although, from past years, it probably is "capped", the only ones that arn't are like, 4u maths, chem, etc..
You can get this data your self, its on the UAC's web site in the UAI section.