for it to be successful, you need to focus on memory thermal pads having 100% contact with the heatsink, core temperature is secondary and others like mosfets and vrm, dont even bother. I did just this on my 3080 and core temp is 48c and memory temperature is around 74 - 78c. What i see, is that most of you trolls are focusing on vrm and mosfets and trust me there is no need as long as you keep your gpu clean, the only issue for them would be dust overtime but even though not much increase in temperature they would have, so focus on memory then core.
Do you also think, that one should use additional thermal paste on both sides of the thermal pads?? That sounds a little bit overkill to me.
Maybe, I've seen people that use thermal pastes on pads and they still get accurate results but its not needed, if you can use a A grade thermal pad you will be fine, you just have to make sure its the same size as the one you remove from the GPU.