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Green circuit board memory stick with black chips and gold contacts

Computer Memory Solutions

Computer Memory Solutions CM2048642666SO 16GB DDR4 2666 SODIMM Fujitsu ESPRIMO K557/R K558/B

SKU CH-EKXG-BETBD

16 GB DDR4 2666 SODIMM module for Fujitsu ESPRIMO K557/R and K558/B systems

  • Capacity16GB
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Timing19-19-19
  • Voltage1.2V
  • 16 GB DDR4 2666 MHz SODIMM boosts multitasking on Fujitsu ESPRIMO K557/R and K558/B
  • CL19 latency at 1.2 V delivers responsive performance with low power draw
  • 260-pin unbuffered non-ECC design fits both supported models without modification
  • Single 16 GB module leaves one slot free for future 32 GB maximum upgrade
  • Backed by Computer Memory Solutions limited lifetime warranty against manufacturing defects

Targeted DDR4 Upgrade

This 16 GB DDR4 2666 SODIMM module is built specifically for Fujitsu ESPRIMO K557/R and K558/B desktops. It installs in a single 260-pin slot and operates at 1.2 V with CL19 timings. The unbuffered, non-ECC design matches the factory memory specification for these systems. Buyers receive one stick to expand or replace existing memory.

Compatibility And Limits

The module suits owners of the listed ESPRIMO models who need to reach the 32 GB maximum across two slots. It will not fit laptops or boards that require ECC, registered or 288-pin DIMM memory. Systems limited to lower speeds or a single slot will not benefit from the full capacity or dual-channel bandwidth. A 64-bit operating system is required to address more than 4 GB.

Sustained Operation

Running at the rated 2666 MHz with 19-19-19 timings, the stick delivers stable throughput for long workloads without a heat spreader. All installed memory operates at the speed of the slowest module or the processor limit. Major-brand chips and unbuffered construction help maintain consistent performance during extended use.

Highlights

  • 16 GB DDR4 2666 MHz SODIMM boosts multitasking on Fujitsu ESPRIMO K557/R and K558/B
  • CL19 latency at 1.2 V delivers responsive performance with low power draw
  • 260-pin unbuffered non-ECC design fits both supported models without modification
  • Single 16 GB module leaves one slot free for future 32 GB maximum upgrade
  • Backed by Computer Memory Solutions limited lifetime warranty against manufacturing defects

Specifications

BrandComputer Memory Solutions
ModelCM2048642666SO
Capacity16GB
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Timing19-19-19
Voltage1.2V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemFujitsu ESPRIMO K557/R, ESPRIMO K558/B
Package Content1 Memory RAM Stick

Questions about this item

Does the Fujitsu ESPRIMO K557/R need a free SODIMM slot to install this 16GB DDR4 2666 module?

Yes, the K557/R has two SODIMM sockets; one must be empty to add this 260-pin 16GB stick.

If I keep the original 8GB stick in the K558/B, will this 16GB DDR4 2666 CL19 module run at its rated speed?

All installed memory runs at the slowest module's speed; mixing may drop the 2666 MHz stick to the older module's lower frequency.

How can I confirm the K557/R is using the full 16GB at DDR4 2666 after fitting this CM2048642666SO stick?

Check Task Manager's Performance tab or BIOS — both should show 16GB detected and a speed of 2666 MHz.

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