sentences:  "Graphics double data rate SDRAM (GDDR SDRAM)" is a type of specialized DDR SDRAM designed to be used as the main memory of graphics processing units (GPUs).GDDR SDRAM is distinct from commodity types of DDR SDRAM such as DDR3, although they share some core technologies.Their primary characteristics are higher clock frequencies for both the DRAM core and I/O interface, which provides greater memory bandwidth for GPUs.