06-22-2020 07:18 AM
06-23-2020 01:38 AM
06-23-2020 03:43 AM
My guess: you shouldn't have used the 1 mm pads over the GPU VRMs. They are too thick to allow the right pressure and contact between CPU and copper CPU heatsink
Maybe even the 0.5 mm could be too thick.
With my latest repaste on G751JY I went with thermal paste everywhere, because even with 0.5 mm pads I noticed higher temperatures on some CPU cores (more than 10°C differences from hottest and coldest core), so I thought that heatsink was not completely "flat" on the CPU die.
06-23-2020 06:59 AM
I initially went with 0.5mm for everything, but after I put the heatsink back on, I inspected the thermal pads from the sides with a lamp, and I could clearly see the light coming through between the VRMs and thermal pad, meaning there was no contact between them at all. That's why I went with 1mm for them. Other parts seemed to make contact with 0.5m just fine so I left them like that.
EDIT: Forgot to ask, what temperatures should I normally expect for cpu/gpu after cleaning everything and reapplying the paste?
06-23-2020 07:04 AM
I know that with 0.5 mm pads or with thermal paste the VRMs are not well in contact with heatsink, but I gave priority to CPU and GPU die contact-pressure-cooling.
Anyway, in my case, using thermal paste over the VRMs resulted in a well spreaded thermal compound: I considered it quite enough.
The fact that other parts make a good contact with 0.5 mm can be seen in a negative way, they are relieving pressure from the chip dies.
About the temperature, I assume you have the 4710HQ or 4720HQ. I don't know exactly because my 4710HQ is undervolted in daily use and overvolted/overclocked when needed, but with stock clocks and voltages you should not touch thermal throttling like you experienced, unless your room temperature is over 30 °C.
Maybe in the middle 80s seems to be plausible and acceptable when playing demanding games.
Right now, with an ambient temperature of 28 °C (it's hot here), my CPU idles at 38-42 °C with a little undervolting (that has little/zero impact on idle temps anyway).