msi rx 570 4gb

Hello I need to change the thermal pads on my msi rx 570 armour 4g oc, I want to know how thick the thermal pads have to be,0,5mm, 1mm, 1,5mm? Thank you

I have a rx 570 4gb using on my gaming pc build but I always been using a 300wat power supply 😅😅 so yesterday I tried turning on my pc all the fans come on but the graphics card won’t power up I try removing it and my pc boot on normally so am wondering if because my power supply not powerful...