Transcend TS512MLK72V3N 4GB DDR3 SDRAM Memory Module - For Desktop PC - 4 GB DDR3 SDRAM - 1333 MHz - ECC - Unbuffered - 240-pin - DIMM

Up to 1333 MHz speed with Unbuffered signal for smooth computer performance DIMM 4 GB of memory to refine your computers performance DDR3 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computers performance