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Two green 200-pin DDR2 SODIMM modules with black chips

Computer Memory Solutions

Computer Memory Solutions CM128644200SODR 2GB (2x1GB) DDR2 533MHz SODIMM memory upgrade

SKU CH-TX7H-1XWBA

A 2 GB dual-stick DDR2 SODIMM kit running at 533 MHz for the ThinkPad R51e 1843

  • Total capacity2 GB (2 × 1 GB)
  • Rated speedDDR2 533 (PC2 4200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL4
  • Memory timings4-4-4
  • Rated voltage1.8 V
  • 2GB total capacity from two 1GB modules
  • DDR2 533MHz speed matches PC2-4200 specification
  • CL4 latency with 4-4-4 timing for responsive access
  • Unbuffered non-ECC design fits standard laptop slots
  • Guaranteed compatible with Lenovo ThinkPad R51e 1843

DDR2 533 MHz SO-DIMM kit

This kit contains two 1 GB 200-pin DDR2 533 (PC2-4200) SO-DIMM modules for a total of 2 GB. It is built for the Lenovo ThinkPad R51e 1843 with a Celeron M 1.5 GHz processor. The modules are unbuffered, non-ECC, CL4 timing and run at 1.8 V. Buyers who need a higher capacity than 2 GB or a newer memory standard cannot use this kit.

DDR2 platform ceiling

DDR2 533 is the fastest speed the ThinkPad R51e 1843 chipset accepts, so the system will not run memory at a higher data rate. The board has only two SO-DIMM sockets and the vendor lists a maximum of 2 GB total, so this kit already fills the platform limit. Builders who want to exceed that ceiling must change the laptop.

2 GB matched pair

The package supplies two identical 1 GB sticks (2Rx8) tested as a matched pair for dual-channel operation in the two available slots. Installing this kit reaches the 2 GB maximum the manufacturer specifies for the R51e 1843. Anyone needing more memory than 2 GB will have to select a different system.

How it compares

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

Price $9.99
Cheaper than about 97% of the 21,161 comparable items (median $397.99).
Total capacity 2 GB (2 × 1 GB)
Lower than about 95% 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).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM128644200SODR
Total capacity2 GB (2 × 1 GB)
Product type200-Pin DDR2 SO-DIMM
Performance
Rated speedDDR2 533 (PC2 4200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL4
Memory timings4-4-4
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Compatible systemsLenovo Thinkpad R51E 1843 Celeron M 1.5 GHz
In the box
Included items2 Memory RAM Sticks

Questions about this item

Is this 2 GB kit the correct capacity for my ThinkPad R51e 1843, or should I look for a different size?

The R51e 1843 supports a maximum of 2 GB across its two slots, so this 2 x 1 GB kit fills the system to its limit.

What does the PC2-4200 / 533 MHz rating mean once the modules are installed in the laptop?

The memory will run at 533 MHz with CL4 timing at 1.8 V, delivering the standard DDR2 bandwidth the chipset expects.

Will these 200-pin DDR2 SODIMMs work in any other DDR2 laptop, or are they locked to the R51e?

They follow the 200-pin DDR2 SODIMM standard, so they fit any notebook that accepts PC2-4200 unbuffered non-ECC modules.

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