Cool GTX
So, do the Thermal Grizzly Minus 8 Pads make a significant difference on Temp or OC ?

I can't answer on that question. :) I did only one run of Valley and temp stuck at 60 degree (C). I may do some tests later, but because i still use GPU as eGPU for my laptop - they don't really proper.
 
My goal wasn't to lower temp camparing with stock. My goal was do some service for a card before transfer it to new assembled PC. I know first owner have got cat (short haired), card have got some dust inside mixed with hair, also leaked silicone and start smell when hot. So, need to do something with that.
 
But HEY, they add some headahe for sure during installing! :)

Best is to do the “independent” test your self. That’s the only way to really know l, especially since your environment and system is different. A worthwhile expense for sure.