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 SK Hynix DDR3 SDRAM devices. These Unbuffered SDRAM DIMMs are intended for use as main memory when installed in systems such as PCs and workstations. Technical Specifications Manufacturer Hynix Manufacturer Part # HMT451U6AFR8C-PB Memory Type DDR3 SDRAM Capacity 4GB Pins 240 Pin Bus Type PC-12800 Error Correction Non-ECC Cycle Time 1.25ns Cas CL11 Data Transfer Rate 1600Mhz Memory Clock 200Mhz Rank Rank 1 Voltage 1.5