Computer Memory Solutions 4GB DDR3 1333 ECC memory upgrade CM5127210600ECCNRH2R8

System-specific ECC upgrade

This 4 GB DDR3 1333 module is built for the Lenovo ThinkStation S20 (X58) 4105, 4157 and 4217 series. It targets workstation owners who need error-correcting memory for data integrity in server-style workloads. The unregistered ECC design matches the platform's supported memory type. Buyers whose systems require registered ECC or non-ECC memory cannot use this kit.

Single-stick kit impact

The package contains one 240-pin DIMM rated at PC3 10600 with CL9 9-9-9 timing at 1.5 V. Adding a single stick increases capacity but does not enable triple-channel bandwidth; the platform needs three matching modules per bank for that mode. Maximum supported memory per socket is 4 GB across six sockets. Mixing this unbuffered ECC stick with registered ECC modules is not supported by the system.

Slot placement and clock behaviour

Install the module into an empty 240-pin slot; the system automatically clocks DDR3-1333 down to 1066 MHz or 800 MHz depending on the installed Xeon processor and total module count. No heat spreader is fitted, so clearance is minimal. The most common issue is populating slots without following the three-per-bank rule, which leaves the channel in single-channel mode and reduces throughput.