Computer Memory Solutions CM5126410600SOSRH 4GB DDR3 1333MHz SODIMM memory upgrade

CMS 4GB DDR3 1333 SODIMM for Lenovo U400

This 4 GB DDR3 1333 MHz SODIMM module is built for the Lenovo Ideapad U400 14" HD Ultrabook. It uses a 204-pin unbuffered non-ECC design with CL7 7-7-7 timing at 1.5 V. The single-rank 1Rx8 configuration fits one of the two available memory sockets in the system.

Sustained load behaviour at CL7 1.5V

Running at DDR3 1333 (PC3 10600) with CL7 latency, the module maintains stable throughput during extended workloads without a heat spreader. The 1.5 V operation matches the ultrabook's standard voltage envelope, so thermal output stays consistent with the original memory specification during long sessions.

Upgrade path from 4GB to 8GB maximum

The U400 supports a maximum of 8 GB across two sockets, so adding this 4 GB stick doubles capacity when the second slot is empty or replaces a smaller module. The jump is worthwhile when the current 4 GB total limits multitasking or browser tab counts, but it cannot exceed the 8 GB ceiling or add a third socket.