Radeon RX 460 2GB

I would like to upgrade my GPU to the Radeon RX 460, it would fit and all that but the issue is my computer's power supply, which is only 180w. I'd like to upgrade my power supply along the lines of what's done in this video View: https://www.youtube.com/watch?v=SCQTj1ei3Ew although this video...

My setup: Asus 970 Pro Gaming/Aura MSI RX 480 Armour 4GB Corsair Dominator Platinum DDR3 1866MHz (4x4GB) I'm looking to replace the thermal pads on all components with Fujipoly Ultra Extreme, as in NB, VRM's, SB, etc... Problem is I don't know the best thickness for each of these components...