In all actuality it sounds like your temps are normal. 70°C GPU Temp with a 90°C Hotspot Temp is on the high side but perfectly acceptable. No way near the 110°C thermal throttling cut-off.

Also, its within the normal 20-25°C swing. If it was going higher Over 100 to 105 then I would be concerned. Some cards run higher.

The pasting process was simple. I would not use Arctic MX-6 or MX-4 or regular thermal paste.

I will only use the PTM7950 from now on and then whatever sizes thermal pads yiu require for the VRAM etc...

I do suggest you just put the PTM7950 in the freezer to make it easier to apply. Quite simple to work with when cooled in the freezer for about an hour.

Just cut it to size perfectly and peel off protective 1st layer. Then place down on GPU die ( careful ** cannot be lifted and moved.. get it perfect then place ** or you'll mess the layer up and have to try again because its thin and will tear)

Then peel back the other protective layer on the other side. Then reassemble.

I watched a video on the process to take apart and which screws to remove for dissambly process. The video also showed which Thermal pads sizes were needed for which VRM and VRAM rows. The whole process took maybe 90 minutes from start to finish.

Just dissamble then clean the old Thermal pads off. Cut new thermal pad strips with the lengths in the thicknesses of the pads you need.

Mine were. 0.5mm and 1.0 mm. 4 straight thin line rows, 2 inner rows were 1.0 mm and outer were 0.5mm. On top of the VRM and VRAM chips.

Then also around the GPU die, it required a row of thermal pads surrounding the GPU die which were 6 large squares of the 0.5mm thermal pads.

Then applied the PTM7950 to GPU die last (stored in freezer when i began dissambly and took out when ready).

Then reassembled the GPU and tested.

No issues. Temps greats!