This message was posted on behalf of Intel Corporation
Hi benjamin.lesueur: Thank you very much for joining the Intel® Compute Stick communities.
According to the TPS (Technical Product Specification) of the stick, the Intel® Dynamic Video Memory Technology (DVMT) is a method for dynamically allocating system memory for use as graphics memory to balance 2D/3D graphics and system performance. If your computer is configured to use DVMT, as the stick is, the graphics memory is allocated based on system requirements and application demands (up to the configured maximum amount). When memory is no longer needed by an application, the dynamically allocated portion of memory is returned to the operating system for other uses. The 1 GB value cannot be reduced or increase in the BIOS, as you mentioned it is a default value, page 11:
Any further questions, please let me know.