90 degrees is a bit toasty for the video card. I would suggest to download MSI Afterburner to control the fan speed of the video card and monitor the temperatures. You likely have to select a higher fan speed. Mine does not go above 75 Celsius after I customized the fan speed curves with MSI Afterburner. MSI Afterburner download link 
Hi Dell Community, I have received my Alienware Aurora R10 Ryzen Edition with an Nvidia RTX3080 GPU. A little over two weeks after receiving the PC, I am experiencing flickering, black screens and crashes ONLY when gaming. When I launch a game, I notice that the GPU usage goes extremely high relative to a game's actual needs (ex. 99% GPU use to play PGA 2K21) and that GPU temperature goes up consistently until flickering and crashing occur. When these happen, I need to force reboot the PC. Looking at other community posts, I feel like the GPU may be at cause for concern (a GPU capacitor-related issue apparently). I am unable to contact technical support, and am wondering what I can do or use as a work-around for this. I've tried reinstalling drivers, and this solution is not working so far.   Thanks in advance!
Aurora R10, RTX 3080, flickering, black screen and crash