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Green circuit board with black memory chips, gold edge connector, no heat spreader

Computer Memory Solutions

Computer Memory Solutions CM1024642666SO 8GB DDR4 2666 SODIMM ThinkPad P43s P53s T490

SKU CH-QCJN-3HFP8

8GB DDR4 2666 SODIMM memory upgrade for ThinkPad P43s, P53s, T490 laptops

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Memory timings19-19-19
  • Rated voltage1.2 V
  • 8GB DDR4 2666 MHz boosts multitasking speed
  • CL19 timing at 1.2V delivers efficient low-latency operation
  • 260-pin SODIMM fits ThinkPad P43s P53s T490
  • Single 8GB stick allows easy future expansion
  • Major-brand chipset ensures reliable system stability

8 GB DDR4 2666 SODIMM for ThinkPad P43s, P53s, T490

This 8 GB module uses 260-pin DDR4 SO-DIMM form factor and runs at 2666 MHz with CL19 timing. It is built for Lenovo ThinkPad P43s, P53s and T490 notebooks that accept non-ECC, unbuffered memory. Buyers whose laptop requires ECC or registered DIMMs cannot use this kit.

Thermals, noise and power draw

Operating at 1.2 V, the stick draws minimal power and produces no audible noise because it has no moving parts. Passive cooling is handled by the notebook’s own thermal solution. The module lacks a heat spreader, so sustained loads rely entirely on chassis airflow.

Single-stick upgrade and matched-pair guidance

The package contains one 8 GB stick; the supplier notes that maximum supported capacity is 16 GB across two sockets. Installing a matched pair enables dual-channel operation for higher bandwidth. Mixing with existing modules forces all memory to run at the slowest installed speed.

How it compares

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

Price $39.99
Cheaper than about 80% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% 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).

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 nameCM1024642666SO
Total capacity8 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
Memory timings19-19-19
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsLenovo ThinkPad P43s, ThinkPad P53s, ThinkPad T490
In the box
Included items1 Memory RAM Stick

Questions about this item

How do I install the CM1024642666SO SODIMM into my ThinkPad T490, and what step is often missed?

Power off, unplug, and remove the base cover. Insert the 260-pin module at an angle until the gold contacts are hidden, then press down until both side clips click. The step often missed is re-seating the module a second time if the system does not POST on first boot.

What maintenance or replacement will this 8 GB DDR4 module need later?

No scheduled maintenance is required. If capacity becomes a bottleneck, the platform supports a maximum of 16 GB across two sockets, so you can add a second 8 GB stick or replace this one with a 16 GB module.

What limit appears first under sustained load with this CL19 1.2 V kit?

The memory controller will throttle bandwidth before the 1.2 V SO-DIMM reaches a thermal limit, since the module has no heat spreader and runs at standard JEDEC voltage.

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