Lenovo 46W0841 DDR4 Ram, Capacity 64GB, 288-Pin DDR4 SDRAM, Speed DDR4 2400 (PC4 19200), Voltage 1.2V, ECC, Load Reduced, Rank 4Rx4, Major Brand Chipset. 64GB (1x64GB) DDR4 2400 (PC4 19200) 4Rx4 288-Pin 1.2V ECC Load Reduced LRDIMM 46W0841 compatible Memory. All NEMIX RAM memory is backed by Lifetime Replacement Warranty and free tech support.