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Green 204-pin SO-DIMM circuit board with black memory chips

Computer Memory Solutions

Computer Memory Solutions CM5126412800SOSRL 4GB DDR3L 1600 CL11 1.35V 204-Pin SO-DIMM memory upgrade

SKU CH-77VT-N434W

4GB DDR3L 1600 SO-DIMM module for ASUS X Series X555DG, X555UA, X555UJ and X556UA notebooks

  • Total capacity4 GB
  • Rated speedDDR3L 1600 (PC3L 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.35 V
  • 4GB capacity adds responsive multitasking headroom
  • DDR3L 1600 MHz speed keeps data flowing smoothly
  • 35V low-voltage operation reduces power draw
  • CL11 11-11-11 timing delivers snappy access latency
  • Tested compatible with ASUS X555 and X556 notebooks

4GB DDR3L SO-DIMM for ASUS X Series

This 4 GB DDR3L module is built for ASUS X Series notebooks including the X555DG, X555UA, X555UJ and X556UA. It runs at 1600 MHz with CL11 timing at 1.35 V. The unbuffered, non-ECC design fits the 204-pin SO-DIMM slot used by these laptops.

Single-stick kit with lifetime exchange

The package contains one memory stick, so there is no dual-channel kit to manage. Computer Memory Solutions backs the module with a lifetime exchange or repair warranty against manufacturing defects when purchased directly from them. A 30-day money-back window is also offered.

12 GB ceiling on a single slot

The supported platforms list a maximum of 12 GB and provide only one memory socket. This 4 GB stick leaves headroom for an 8 GB module if the board accepts it, but a second stick cannot be added. Buyers needing more than 12 GB total or a second channel should look elsewhere.

How it compares

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

Price $19.99
Cheaper than about 91% 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 $5.00 per GB
Cheaper than about 77% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM5126412800SOSRL
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
Memory timings11-11-11
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsASUS X Series Notebook X555DG, X555UA, X555UJ X556UA
In the box
Included items1Memory Ram Stick

Questions about this item

Will the 204-pin DDR3L SO-DIMM need replacement if I later upgrade to the 12GB maximum supported by the X555UA?

The notebook supports up to 12GB total; adding this 4GB stick leaves room for further modules, so replacement is not required unless you exceed the socket limit.

What timing bottleneck appears first during sustained loads on this CL11 1600 MHz module?

The fixed 11-11-11 latency and 1600 MHz data rate set the bandwidth ceiling; under continuous use the CAS latency becomes the limiting factor before thermal throttling.

How much heat and power does the 1.35V unbuffered stick produce when running all day in an X556UA?

At 1.35V the DDR3L module draws low power and runs cooler than standard DDR3, and with no heat spreader it relies on the notebook's existing airflow for passive cooling.

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