Asus ESC500 G2 - Manual (Page 47)

3-5 ASUS ESC500 G2
2. GPU Boost switch
Turning this switch to Enable will automatically optimize the system for fast,
yet stable GPU speed.
For ensuring the system performance, turn the switch setting to Enable when
the system is powered off.
The GPU Boost Switch functions only when you install the DESKTOP CPU that
supports onboard graphics.