This 128GB server memory includes four 32GB modules with a total capacity of 128GB. The memory features registered ECC technology and operates at a bus speed of PC4-19200 (DDR4-2400). The HMA84GR7MFR4N-UH model is designed for use in RDIMM form factor systems with 288 pins. This is server and workstation memory, it will not work in a desktop or laptop. Memory was removed from working servers and has a 30 day guarantee.