Asus EN8400GS SILENT/DI/512MD2(LP) Software Reference Manual page 42

HyperDrive
ASUS SmartDoctor allows you to set the GPU and memory clocks manually.
With the HyperDrive function enabled, ASUS SmartDoctor takes over the
overclocking job. It will fine tune the GPU clock according to the HyperDrive
mode. For example, when 3D mode is set, ASUS SmartDoctor will
automatically increase the GPU clock when running 3D graphics for better
performance.
NOTE: For some models do not support HyperDrive.
ASUS GamerOSD
The ASUS GamerOSD is for better 2D/3D graphics performance. It also
provides some features necessary for various ASUS utilities, including
SmartDoctor, GameFace and OSD(On Screen Display). Refer to your manual
for details.
GPU
A graphics processing unit (GPU) is a microprocessor that has been
designed for processing 3D graphics. The processor is capable of handling
millions of math-intensive processes per second. The GPU is the heart of
modern graphics cards, relieving the CPU much of the graphics processing
load.
VCC
The supply voltage on a graphics card from AGP or PCIE bus. The standard
voltage value should be around 3.3V.
VCore
The supply voltage for the GPU on a graphics card. The standard VCore
voltage value is slightly different from model to model.
FBVDDQ
The working voltage of the memory on a graphics card. The standard
FBVDDQ voltage value is memory-dependent.
NOTE: For some models do not monitor FBVDDQ value, ASUS SmartDoctor
will disable the FBVDDQ item on the voltage page
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