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RefreshRate service and Panel Override

Star I
System: Windows 10
Battery or AC: AC
Description: RefreshRate service and Panel Override setting
Model: GX701GXR
Frequency of Occurrence: Always
Reset OS: Yes

Hi, I've just received my ASUS GX701 with 300Hz display. With the stock OS, the Panel Override was disabled by default. Turning it on was possible, but didn't make any visible difference, neither in iGPU or descrete/G-Sync modes - the display kept always working at 300Hz without any problems. Now I've installed a clean Win10 and trying to keep ASUS apps and the drivers to the bare minimum. May I ask for a technical explanation what exactly the panel override setting and the refresh rate service do, and whether I need to install it at all? Thanks a lot in advance.