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Green circuit board with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions CM256646400SO 2GB DDR2 800MHz SODIMM for Toshiba Mini Notebook Nb250 Nb255

SKU CH-Z355-QE6A4

A 2 GB DDR2 800 MHz SODIMM module that upgrades compatible Toshiba Mini Notebook models to their maximum memory capacity

  • Total capacity2 GB
  • Rated speedDDR2 800 (PC2 6400)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL6
  • Memory timings6-6-6
  • Rated voltage1.8 V
  • 2 GB DDR2-800 MHz boosts multitasking on compatible Toshiba mini notebooks
  • CL6 6-6-6 timing at 1.8 V delivers stable system responsiveness
  • 200-pin SODIMM form factor fits Nb250 and Nb255 memory slots directly
  • Single 2 GB module enables maximum capacity upgrade in one step
  • Major-brand chipset with limited lifetime warranty ensures long-term reliability

Compatible DDR2 SODIMM for Toshiba Mini Notebook

This 2 GB module is built specifically for the Toshiba Mini Notebook Nb250 and Nb255 series. It suits owners of those netbooks who need a direct replacement or a single-stick upgrade to the supported maximum. Buyers with DDR3 variants of the same chassis cannot use this part.

DDR2 800 PC2-6400 200-pin specification

The decisive spec is the DDR2 800 MHz (PC2-6400) 200-pin SO-DIMM interface with CL6 timing at 1.8 V. Only systems designed for this exact DDR2 generation and pin count will accept the module. DDR3 versions of the Nb250 or Nb255 require a different memory type entirely.

Simple slot access with generation caution

Installation follows the usual SODIMM procedure: power off, open the memory door, align the notch and press until the clips latch. The common mistake is ordering this DDR2 stick for a Nb250 or Nb255 unit that shipped with DDR3; the notch position differs and the module will not seat.

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
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 nameCM256646400SO
Total capacity2 GB
Product type200-Pin DDR2 SO-DIMM
Performance
Rated speedDDR2 800 (PC2 6400)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL6
Memory timings6-6-6
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Compatible systemsToshiba Mini Notebook Nb250 Nb255
In the box
Included items1 Memory RAM Stick

Questions about this item

What does the 800 MHz DDR2 rating mean for my Toshiba Mini Notebook Nb250 or Nb255?

The module runs at 800 MHz (PC2-6400) with CL6 timing, delivering the maximum DDR2 bandwidth supported by those notebooks.

How does the 200-pin SO-DIMM interface limit what I can install?

The 200-pin DDR2 SO-DIMM slot only accepts DDR2 modules; DDR3 or other generations will not fit or function.

Will this 2GB stick physically fit the memory slot in my Nb255?

Yes, it is a standard 200-pin DDR2 SO-DIMM (1.8 V, unbuffered, non-ECC) matching the factory slot dimensions.

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