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Two green DDR3 SODIMM modules with black chips and gold contacts

Computer Memory Solutions

Computer Memory Solutions CM512648500SODRH 8GB (2x4GB) DDR3 1066MHz SODIMM for Lenovo ThinkPad T420i 4177-xxx

SKU CH-6TCW-B91ZP

8 GB DDR3 kit with two 4 GB SODIMM modules rated at 1066 MHz for Lenovo ThinkPad T420i 4177-xxx

  • Total capacity64 MB
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 8GB dual-channel kit upgrades ThinkPad T420i performance
  • DDR3 1066MHz CL7 timing matches factory specifications
  • 204-pin SODIMM form factor fits both memory slots
  • Unbuffered non-ECC design ensures notebook compatibility
  • 5V operation maintains standard power efficiency

System-Specific DDR3 Upgrade Kit

This 8 GB kit contains two 4 GB SODIMM modules built for the Lenovo ThinkPad T420i 4177-xxx series. Each stick uses 204-pin DDR3 running at 1066 MHz with CL7 latency and operates at 1.5 V without ECC or buffering. The unbuffered 2Rx8 design matches the notebook's two memory slots and supports the platform's 16 GB maximum capacity.

Direct Slot Installation

The modules fit the factory SO-DIMM sockets without adapters or BIOS changes. Because they are unbuffered and non-ECC, they work with the standard consumer memory controller found in the compatible ThinkPad models. The kit occupies both available slots, so no further memory expansion is possible after installation.

8 GB Total Capacity

The 8 GB provided by this kit sits halfway to the system's 16 GB ceiling, giving headroom for typical office workloads and light multitasking. Users needing the full 16 GB would have to replace both modules with higher-density sticks. The 1066 MHz speed ceiling is fixed by the platform, so faster DDR3 modules would simply downclock to this rate.

How it compares

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

Price $34.99
Cheaper than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 64 MB
Lower than about 99% of the 20,941 comparable items (median 32 GB).
Price per GB $546.72 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM512648500SODRH
Total capacity64 MB
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 T420I 4177-Xxx Notebook Series
In the box
Included items2 Memory RAM Sticks

Questions about this item

What maximum capacity can the ThinkPad T420i 4177-xxx accept with these two SODIMM modules installed?

The notebook supports up to 16 GB total across its two slots, so this 8 GB kit leaves room for a future upgrade if needed.

How much power do the 1.5 V DDR3 1066 MHz modules draw during continuous operation?

Running at the standard 1.5 V, the unbuffered DDR3 SODIMMs draw only a few watts each, adding minimal heat to the chassis during all-day use.

Does the ThinkPad T420i 4177-xxx require any firmware update or special BIOS setting before installing this 204-pin DDR3 kit?

The kit is guaranteed compatible with the listed ThinkPad series; no extra firmware or BIOS changes are mentioned for installation.

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