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

Lifetime warranty BRAND Computer Memory Solutions 

30 day money back guarantee 

Compatible with: IBM eServer xSeries 336 (8837-xxx) 

Max Memory: 8 Sockets (4 Banks of 2 Max Memory 16GB Notes: 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. This chipset supports a maximum of 8 ranks. Kit part numbers consist of two single-rank modules.

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