The 8GB SAMSUNG 2RX4 PC3L-10600R M393B1K70CH0-YH9 is a server-grade, 8GB DDR3 Low-Voltage (1.35V), 1333MHz Registered DIMM with ECC (Error Correction Code). This specific memory module is designed for servers, not desktop PCs or laptops, and features a dual-rank (2Rx4) configuration, a CL9 latency, and a 240-pin count.