Its in the BIOS. Under advanced and then video. You can select how much ram it uses.
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Keep the default BIOS setting for IGD Aperture Size and IGD Min Memory. This values are used only during POST and to boot of the windows.
Window 10 assigns automatically the maximum available graphics memory and it depends off how much RAM you have. Usually it assigns about half of available RAM. In my NUC where I have 16GB RAM installed, 8264MB is available for graphics. You can see how much Total Available Graphics Memory you have in your system. To do this open the Advanced Display Setting and then the Display adapter properties.
Leon is absolutely correct. Let the O/S (and Intel HD Graphics driver) take care of this.
This message was posted on behalf of Intel Corporation
Thank you very much to all the peers participating on this thread for the information posted previously.
I just wanted to confirm the information from lw1948, as correct, the best thing to do is keep the values of the BIOS to defaults and Windows® 10 will take care of assigning enough amount of memory for graphics for the NUC to work properly.
Any questions, please let me know.