SK hynix Unbuffered DDR3 SDRAM DIMMs (Unbuffered Double Data Rate Synchronous DRAM Dual In-Line Memory Modules) are low power, high-speed operation memory modules that use DDR3 SDRAM devices. These Unbuffered SDRAM DIMMs are intended for use as main memory when installed in systems such as PCs and workstations. Hynix Original.