The Intel® 82915G Graphics and Memory Controller Hub (GMCH) is a key component inIntel® 915G Graphics and Memory Controller, integrating graphics, memory, and I/O functions. It supports DDR2 memory, enhancing system performance, and incorporates Intel® Extreme Graphics 2 for improved graphics processing. The GMCH enables efficient data flow and high-speed communication between the CPU, memory, and peripherals, optimizing overall system functionality.