Ax - Ddr4 - 64 Gb - Lrdimm 288-Pin - 2666 Mhz / Pc4-21300 - Cl19 - 1.2 V - Load-Reduced - Ecc - For Lenovo Thinksystem Sd530, Sn550, Sn850, Sr530, Sr550, Sr630, Sr650, Sr850, Sr950, St550