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Green circuit board SODIMM memory module with black chips 204-pin DDR3 1333MHz 4GB CL7

Computer Memory Solutions

Computer Memory Solutions 4GB DDR3-1333 CL7 SODIMM for ThinkPad X220

SKU CH-4XWD-F05G7

A 4 GB DDR3 SODIMM running at 1333 MHz with CL7 timing, built for ThinkPad X220 models 4287, 4290 and 4291

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB capacity adds responsive multitasking headroom for ThinkPad X220
  • DDR3-1333 CL7 timing delivers low-latency data access at 1333 MHz
  • 204-pin SODIMM form factor fits X220 4287, 4290, 4291 slots directly
  • 5 V unbuffered operation matches factory voltage for stable compatibility
  • Major-brand chipset ensures reliable long-term operation under daily workloads

Targeted upgrade for ThinkPad X220

This 4 GB DDR3-1333 SODIMM is built specifically for Lenovo ThinkPad X220 models 4287, 4290 and 4291. It provides a single-module capacity increase for owners who need more memory in those systems without mixing speeds or form factors.

Low-voltage unbuffered operation

Running at 1.5 V with CL7 7-7-7 timings, the module draws minimal power and generates little heat inside the compact chassis. No heat spreader is fitted, so airflow from the laptop’s existing fan is sufficient for normal workloads.

204-pin SO-DIMM with major-brand chips

The stick uses 2Rx8 organisation on a standard 204-pin edge connector that slots directly into the X220’s memory socket. Unbuffered, non-ECC design matches the platform’s requirements and the major-brand chipset ensures reliable compatibility day to day.

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 nameCM5126410600SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
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 X220 4287, 4290, 4291
In the box
Included items1 Memory RAM Stick

Questions about this item

How do I install this 204-pin DDR3 SODIMM in my ThinkPad X220 and which step do people often miss?

Power off, remove the battery, open the bottom memory door, insert the module at 30 degrees until the gold contacts are hidden, then press down until both side clips click — the step most skip is re-seating the battery before first boot.

What maintenance or replacement will this 4GB CL7 module need over time?

No routine maintenance is required; if errors appear later, run a memory diagnostic and replace the stick if it fails, as the chips are not serviceable.

What limit appears first when this 1.5 V DDR3-1333 kit runs sustained workloads?

The 1333 MT/s data rate and CL7 latency set the throughput ceiling long before thermal throttling becomes an issue on this unbuffered SODIMM.

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