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

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.