RivaTuner & the Startup folder

[teh roxxors]

After configuring an OC with RivaTuner, the following Startup Items are loaded into the Startup folder via Registry commands:

NvCpl
--------->RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup

RivaTuner
--------->"C:\Program Files\RivaTuner v2.0 RC 16\RivaTuner.exe"/S

RunDLL32
--------->RunDLL32.EXE NvMCTray.dll,NvTaskbarInit

Are all three necessary to maintain overclock settings for an nVidia card?