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

Computer Memory Solutions

Computer Memory Solutions CM512648500SODRH 4GB DDR3 1066MHz SODIMM

SKU CH-173D-3T2EZ

4GB DDR3 1066MHz SODIMM module with CL7 timing for compatible Lenovo ThinkPad T400 and T400s models

  • Total capacity4 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB capacity expands multitasking headroom on compatible ThinkPads
  • DDR3-1066 speed matches factory PC3-8500 spec for drop-in upgrades
  • CL7 7-7-7 timings deliver low-latency response in supported systems
  • 204-pin SODIMM form factor fits T400 and T400s slots directly
  • 5V unbuffered non-ECC design aligns with original laptop requirements

Lenovo ThinkPad T400s upgrade module

This 4 GB DDR3 SODIMM runs at 1066 MHz with CL7 timing and 1.5 V operation. It is built for the ThinkPad T400s series including models 2801, 2808, 2809 and 2815. The unbuffered non-ECC stick uses a 204-pin layout and 2Rx8 rank organisation. It adds capacity to compatible laptops without configuration changes.

Thermals noise and power in daily use

The module draws 1.5 V and produces minimal heat because it has no heat spreader and no active cooling. Silent operation is guaranteed as there are no moving parts. Power consumption stays low during typical office workloads and web browsing. The JEDEC-standard voltage keeps battery impact small.

Single stick package with lifetime warranty

The box contains one memory stick only; no tools, adapters or software are included. Computer Memory Solutions backs the part with a limited lifetime warranty when purchased directly from them. Compatibility is validated for the listed ThinkPad T400 and T400s model numbers. Buyers needing dual-channel kits or higher-density modules should look elsewhere.

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).

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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 systemsLenovo Thinkpad T400S 2809, 2815, 2801, 2808
In the box
Included items1 Memory RAM Stick

Questions about this item

How do I install the 204-pin SODIMM in my Lenovo ThinkPad T400s 2809, and what step is often missed?

Power off, unplug, remove the battery, open the memory door, insert the module at an angle until the gold contacts are hidden, then press down until both side clips click — the step often missed is reinserting the battery before the first boot.

Will the 1.5 V DDR3 modules need any maintenance or replacement over time?

No routine maintenance is required; the unbuffered non-ECC SODIMM has no moving parts, so replacement is only needed if a memory test reports errors or you upgrade capacity.

What limit appears first when the CL7 1066 MHz memory runs under sustained load?

The CAS latency of CL7 at 1066 MHz sets the timing ceiling; the module cannot run tighter timings or higher frequency without exceeding its rated specification.

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