I do know the difference between overclocking/underclocking and overvolting/undervolting.
It's just that I've been unable to decrease the voltage of graphics cards much without having to reduce the core clock and shaders at the same time to avoid artifacts, but I was using a different graphics card from the one in your laptop so hopefully you will have better luck
The main reason I posted about decreasing those settings is I thought you might have been having problems with shutdown and undervolting the card by a large amount might greatly reduce system temp.
It's also possible that my definition of undervolting is completely wrong
But for me undervolting would be decreasing the core voltage of a system while maintaining performance or increasing it example my CPU is undervolted
to less than stock volts but also overclocked
to an increased clockspeed.
If I'm wrong about undervolting then please correct me.
Either way those programs I linked can certainly change the voltage given to the gpu and edit clock and fan speeds if needed.