First off, Kindly provide FULL PC specs, including the make and model of your Motherboard, and PSU. Did you use the
DDU tool to do a clean re-install of the drivers ? If not, then try doing this.
https://www.guru3d.com/files-details/display-driver-uninstaller-download.html
Also, delete and remove all previously saved profiles and GPU settings which you may have applied via any Overclocking tool, clock speed values, Power limit, voltage etc.
If need be, completely re-install the overclocking tool as well.
If "performance" related issue:
-Note the "exact" point in which the performance reduction occurred (ie: After Windows update, After Bios update, After Driver update, After thermal system shutdown, After Hardware change/upgrade etc...)
Please supply the following system details/information:
(Complete System Specs)
-CPU make and model# (clock speed/voltage, type of cooler, and "Core" temperature @ idle and load)
-Motherboard make & model# (include Bios version if graphics card is not recognized or you are having stability issues)
-RAM (amount, clock speed, model#/link of kit, configuration)
-Graphics card(s) make and model# (clock speed, voltage if modified, Driver version and GPU temp both @ idle and load)
-Power supply make,model#, "AND" age (note if using 110V or 220V A/C input)
-HDD/SSD configuration (ie: Raid setup/ back up/ OS drive/etc..)
-Case/Chasis make,model# (fan make, model#, and configuration if having thermal issues)
-Operating System (If using Windows note Framework and service pack version)
-Monitor make, model#, and resolution (If model# is unknown list resolution and refresh rate)