Sk hynix 8gb ddr4 ram sticks with the model number hma41gu7afr8n-tf.
specifications
capacity: 8gb per stick
speed: 2133 mhz (pc4-2133p)
type: ddr4 sdram (2rx8)
samsung 8gb pc3l-12800r ddr3 ecc registered server ram module (model number m393b1g70bh0-yk0).specificationscapacity: 8 gbtype: ddr3l (low voltage, 1.35v)speed: 1600 mhz (pc3l-12800)form factor: rdimm (registered dimm) for servers/workstations