We guaranty this kit will work in your machine. Manufactured by Computer Memory Solutions 8GB Total memory consisting of 2x 4GB DDR2-400 240 PIN Registered Dual In-line Memory Lifetime exchange or repair warranty against manufacturing defects.
Maximum Memory: 64GB
Expansions: 4 Sockets for Active Memory Expansion Cards 4 Sockets per Active Memory
Expansion Card Compatible with: IBM System x3850 8864-xxx IBM System x3850 8864-xxx