4pcs 2GB PC2-3200 ECC Registered DIMM SINGLE Rank, 18chips only Make sure the memory you purchase for this system is single rank other wise they will not work.

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Compatible with: IBM Intellistation Z Pro (6223-xxx) 

Max Memory: 6 Sockets (3 Banks of 2 Max Memory 16GB Notes: 

This system supports only ONE dual-rank Kit either 4gb or 8gb kits installed in the first bank ONLY. To reach 16GB maximum, install one 8GB Kit in the first bank and two 4gb kits single rank in the second and third banks. The Intellistation Z Pro comes standard with Chipkill memory. This system can support both the Chipkill and Non-Chipkill memory. When mixing Chipkill and Non-Chipkill kits, the system will not perform the Chipkill function.