4pcs 16GB 1333MHz ECC Register Module, You might receive 1066mhz or 1600mhz since all of them work in there. Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS A 64-bit operating system is required to utilize more than 4GB of memory.
Maximum
Memory: 128GB ECC UDIMMs 384GB Reg ECC RDIMMs 512GB Reg ECC 1.35V LV RDIMMs 768GB LRDIMMs with future products
Expansions: 24 Socket (s) using two processors 12 Socket (s) per processo
Compatible with: HP/Compaq ProLiant ML350p Gen8 (G8)