@strokemyouioui Hello!
Thanks for posting to Ubisoft Discussions. Sorry to hear about the difference in GPU usage between these two accounts.
We appreciate all the details of the investigation you've done so far, and the inclusion of your system specs. Currently, your in-game settings are tied to your Ubisoft Account, therefore we'd advise you to ensure that you have the exact same settings on both accounts, to see if the issue persists.
You will be able to locate your GameSettings.ini file in your Documents (C:\Users\CurrentUser\Documents\My Games\Rainbow Six - Siege\) and you can check both files for both of your accounts, which will allow you to also see if settings match.
If this doesn't solve the issue, try deleting ...