Rivatuner is reading the data from your system.
Go to Device Manager and uninstall the old processor.
In case is hidden open Command prompt ( as admin) and type SET DEVMGR_SHOW_NONPRESENT_DEVICES=1 and hit Enter
Then type devmgmt.msc and hit Enter, Device Manager opens.
On the View tab, select Show hidden devices. You will see the old CPU listed under Processors.
Restart the computer.