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Green circuit board SODIMM module with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions CM512648500SODRH 4GB DDR3 1066 SODIMM

SKU CH-8N4C-19YGD

4 GB DDR3 1066 SO-DIMM module with CL7 timing for Panasonic Toughbook 31 Mk1 CF-31

  • Total capacity4 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4 GB capacity expands Panasonic Toughbook 31 Mk1 memory
  • DDR3 1066 MHz speed matches CF-31 system requirements
  • CL7 7-7-7 timing delivers responsive data access
  • 204-pin SODIMM form factor fits both memory sockets
  • 5 V unbuffered design ensures stable low-power operation

System-specific DDR3 SODIMM

This 4 GB DDR3 module is built for the Panasonic Toughbook 31 Mk1 Cf-31 series. It runs at 1066 MHz with CL7 timing and 1.5 V unbuffered operation. The 204-pin SO-DIMM form factor fits the laptop’s two memory sockets directly.

Suited for single-slot upgrades on 32-bit

Technicians restoring or maintaining a compatible Toughbook 31 Mk1 will find the guaranteed match valuable. Buyers who need more than 4 GB per module or a different pin count cannot use this part. The 2Rx8 rank layout is fixed for this model.

DDR3 1066 CL7 specification decides fit

The PC3-8500 speed grade and 7-7-7 timings are the defining parameters for compatibility. Only systems that accept DDR3 1066 unbuffered non-ECC SO-DIMMs will recognise the module. Verify the exact Toughbook model before ordering.

How it compares

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

Price $18.99
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 $4.75 per GB
Cheaper than about 80% 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 nameCM512648500SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL7
Memory timings7-7-7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsPanasonic Toughbook 31 Mk1 Cf-31, Cf-31
In the box
Included items1 Memory RAM Stick

Questions about this item

Will the 204-pin DDR3 SODIMM need a heat spreader added later for sustained loads?

The module ships without a heat spreader; DDR3 at 1.5 V and CL7 runs cool enough in a Toughbook chassis that extra cooling is not required.

What limit appears first when the 4 GB stick runs at 1066 MHz continuously in a CF-31?

The 4 GB capacity ceiling is reached before bandwidth or thermal limits, especially under a 32-bit OS that caps usable memory at 4 GB.

How much heat and noise does the 1.5 V unbuffered module add during all-day operation?

It draws standard DDR3 power with no fan or moving parts, so it adds negligible heat and zero audible noise to the laptop.

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