hi. i confirm this with 100%. i have p775tm and install RTX2080 Super, my 330w ac power charger is power off when loading only GPU, and laptop shut down in stress gpu+cpu together. i bought eurocom charger 780w and my power consumption overall in stress tests Aida64 CPU stress+Furmark = 400W power consumption.
Therefore, we can conclude that the consumption is very high and that the power supply cannot take the laptop in working condition. and I say right away - no power plan settings DO NOT CHANGE the power consumption (battery saving, balance, enterprise, silent etc) of the video card; it does not work with the cool control center v1.0 v2.0 versions and different revisions. Also, the heating is very high, in 5 minutes the temperature in games is -90 degrees and no matter what settings - medium or ultra - the video card still consumes 205-210 watts according to HW info sensors. and when play in games gpu drops frequency to 300 mhz core and 100 mhz memory to 10-15 sec, then power full up, after 2-3 mit - again drop... rtx2080s on p775tm not working properly. and no modded Vbios with reduced TDP down (150w max or 175 w max). only one for x170sm