MSI X99S MPOWER Overclocking Guide - Manual (Page 9)

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IGPU SPEED OVERCLOCKING
GT Ratio 25x50 (1250MHz) GT Ratio 32x50 (1600MHz)
The built-in Intel HD Graphics 4600 display chipset, support DirectX 11, can improve 3D
graphics performance by adjusting the GT Ratio.
Take the K SKU CPU as an example, GPU frequency is 1250MHz (calculated as
25x50=1250), and the clock will be up by 50MHz when Ratio value added 1x. Along with
the performance increasing, GPU voltage also has to be increased a certain ratio to keep
the system stabilization.
Please note that when the GPU is overclocked, it is only effective when the loading
frequency of 3D Graphic is present.
Reference Setting ~ IGPU 1600MHz
Adjust GT Ratio : 32X
CPU GT Voltage : 1.2V