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Green 200-pin DDR SODIMM stick with black chips

Computer Memory Solutions

Computer Memory Solutions CM128642700SO 1GB DDR333 SODIMM memory upgrade

SKU CH-TYAA-06MSK

1 GB DDR1 SODIMM upgrade for Lenovo ThinkPad R51 notebooks, 333 MHz CL2.5 unbuffered non-ECC module

  • Capacity1GB
  • Type200-Pin DDR SO-DIMM
  • SpeedDDR 333 (PC 2700)
  • CAS LatencyCL2.5
  • Timing2.5-3-3
  • Voltage2.5V
  • 1GB capacity for compatible ThinkPad R51 systems
  • DDR333 speed at 2.5V for stable operation
  • 200-pin SODIMM form factor fits notebook slot
  • CL2.5 timing with unbuffered, non-ECC design
  • Major-brand chipset on genuine CMS module

1 GB DDR333 SODIMM for ThinkPad R51

This 1 GB DDR333 SODIMM module is built for the IBM Lenovo ThinkPad R51 notebook series. It matches the factory 200-pin DDR1 PC2700 specification and runs at 2.5 V without ECC. Owners of compatible R51 models can add a single stick to reach the system's supported memory ceiling.

Sustained load behaviour with CL2.5 timing

The module operates at CL2.5 with 2.5-3-3 timings, delivering consistent bandwidth during extended workloads rather than only in short bursts. Unbuffered major-brand chips draw less power and run cooler, helping the ageing platform maintain stability through long compile, browsing or office sessions without thermal throttling.

Replaces IBM FRUs 31P9834, 31P9835, 10K0034.

This stick directly substitutes the listed IBM Lenovo part numbers found in R51 units such as 1829, 1830, 1831, 1836, 1840, 1841, 2883, 2887, 2888, 2889, 2894 and 2895. The upgrade is worthwhile when the notebook currently runs with less than 1 GB or when a failed original module needs a guaranteed-compatible replacement.

Highlights

  • 1GB capacity for compatible ThinkPad R51 systems
  • DDR333 speed at 2.5V for stable operation
  • 200-pin SODIMM form factor fits notebook slot
  • CL2.5 timing with unbuffered, non-ECC design
  • Major-brand chipset on genuine CMS module

Specifications

BrandComputer Memory Solutions
ModelCM128642700SO
Capacity1GB
Type200-Pin DDR SO-DIMM
SpeedDDR 333 (PC 2700)
CAS LatencyCL2.5
Timing2.5-3-3
Voltage2.5V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemIbm Lenovo Thinkpad R51 Notebook Series
Package Content1 Memory RAM Stick

Questions about this item

How much power does the 2.5 V DDR333 module draw during continuous use?

The module uses high-density chips that draw less power and run cooler than other brands, keeping the notebook stable all day.

What must the notebook already provide to accept this 200-pin DDR1 SODIMM?

An available 200-pin DDR SO-DIMM slot that operates at 2.5 V and supports PC2700 333 MHz unbuffered non-ECC memory.

Does this CM128642700SO match the IBM FRU numbers 31P9834, 31P9835, 10K0034, 10K0035 and 33R4967 used in the ThinkPad R51?

Yes, the module is listed as compatible with those IBM Lenovo part numbers across the R51 series.

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