From this article:
" If Ultimate Performance continues to fail to appear within the Power Options pane, you must disable Modern Standby in Windows. The quickest way to do that is to run the following command through an elevated command line:
reg add HKLM\System\CurrentControlSet\Control\Power /v PlatformAoAcOverride /t REG_DWORD /d 0
Once you do that, re-run the Ultimate Performance activation command:
powercfg –duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61
Restart your computer, bring up the Power Options console, and Ultimate Performance should be present among the list of power plans."