This message was posted on behalf of Intel Corporation
The Intel® HD Graphics 5100 has a graphics max dynamic frequency of 1.2GHz, however; in most cases, the computer manufacturer has already configured the system to use the maximum amount of graphics memory that is possible for your particular computer model. Sometimes you can change these values through BIOS level, if there are no options available in the BIOS configuration then is not possible to change it. So, my recommendation is to check with your computer manufacturer if there are tips on increasing the amount of graphics memory for your computer model.
If you are interested in additional information see graphics memory frequently asked questions: