Quick question about powertune option in polaris bios editor

[Gmzombie]

Ok guys have a quick question. I have some gigabyte 570 4gb mining edition cards and I never understood why the max power limit is 90 when the tdp w is 120. Should thst not be reversed? Ive had a hard time with some of these cards and ive always had to raise both of these numbers up to tdp w 125 and max power to 130. Am i wrong in having to do that? Most other cards arent like this. When the card needs to be adjusted it gives me a weird core voltage that adjusts alot along with core clock. If i adjust it them they stay solid. Any advice