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Green rectangular circuit board with gold edge connectors and black memory chips, 204-pin DDR3 SODIMM form factor

Computer Memory Solutions

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

SKU CH-CKVG-AQM97

A 4 GB DDR3 SODIMM upgrade for the Lenovo IdeaPad U400, running at 1333 MHz with CL7 timing

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4 GB capacity adds responsive multitasking headroom
  • 1333 MHz DDR3 speed matches system requirements
  • CL7 timing delivers low-latency data access
  • 5 V operation keeps power draw efficient
  • 204-pin SODIMM form factor fits the U400 slot

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.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 96% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $2.75 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM5126410600SOSRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL7
Memory timings7-7-7
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo Ideapad U400 14 in Hd Ultrabook
In the box
Included items1 Memory RAM Stick

Questions about this item

How much power does this 1.5 V DDR3 module draw when the ultrabook runs all day?

It operates at the standard 1.5 V for DDR3 SO-DIMMs; the laptop’s own power management controls total draw.

Does my Lenovo IdeaPad U400 need any BIOS update or extra parts before I install this 204-pin stick?

The module is built for the U400 and fits the existing 204-pin slots; no additional hardware is required.

Can I keep the original 4 GB stick and add this 4 GB module to reach the 8 GB maximum?

Yes, the U400 has two sockets and supports up to 8 GB, so adding this 1Rx8 module alongside the original works.

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