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Green circuit board with black memory chips and gold edge connectors

OWC

OWC 4GB DDR4 2666MHz CL19 1.2V 260-pin SODIMM laptop RAM

SKU CH-W265-7FM7E

Adds 4GB of DDR4 2666MHz memory to compatible laptops, all-in-ones and NAS systems with a 260-pin SODIMM slot

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forLaptops, All-in-One Systems, and NAS Systems
  • Boost responsiveness with 4 GB DDR4 2666 MHz CL19 module
  • JEDEC-standard 1.2 V design ensures warranty-safe upgrade
  • Backward compatible with 2400 MHz and 2133 MHz systems
  • Single 260-pin SODIMM fits laptops, AIOs and NAS units
  • Easy DIY install supported by OWC video guide

4 GB DDR4 2666 MHz SODIMM module

This single 4 GB DDR4 2666 MHz CL19 SODIMM upgrades laptops, all-in-one PCs, mini desktops and NAS units. It runs at 1.2 V, uses a 260-pin unbuffered non-ECC layout and is backward compatible with 2400 MHz and 2133 MHz systems. The module replaces Crucial CT4G4SFS8266 and meets JEDEC and RoHS standards.

DDR4 2666 MHz speed ceiling

The DDR4 2666 MHz interface caps peak bandwidth at the PC4-21300 rate, so workloads that scale with memory throughput will hit that limit. CAS latency of 19 sets the minimum access delay, and the 1.2 V operating voltage is fixed by the DDR4 standard. Systems that require ECC or registered DIMMs cannot use this module.

4 GB capacity for light multitasking

Four gigabytes handles a single OS, browser tabs and office apps comfortably. It runs out when several large applications or virtual machines compete for RAM, forcing the system to swap to slower storage. Buyers who need more headroom for heavy multitasking, content creation or server workloads should look for higher-capacity kits.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 81% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB
Lower than about 80% of the 1,886 comparable items (median 16 GB).
CAS latency 19
Lower than about 90% of the 70 comparable items (median 40).
Price per GB $6.00 per GB
Typical for this category: the median of 1,886 items is $5.94 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 nameOWC
Part number2S6D41R804 GB
Total capacity4 GB
Product type260-Pin DDR4 Non-ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forLaptops, All-in-One Systems, and NAS Systems

Questions about this item

Is the 4 GB module the only capacity available for this OWC DDR4 2666 MHz SODIMM?

The listing covers a single 4 GB stick; other capacities are not described here.

Will the CL19 latency at 2666 MHz deliver the rated PC4-21300 bandwidth in my laptop?

Yes, the module runs at 2666 MHz with CAS 19, matching the PC4-21300 specification when the system supports that speed.

Does the 260-pin DDR4 interface limit me to 2666 MHz, or can it run faster?

The module is rated for 2666 MHz and is backward compatible with 2400 MHz and 2133 MHz systems; it does not run faster than 2666 MHz.

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