G.Skill F4-2666C18S-16GRS 16GB DDR4 2666MHz SO-DIMM

Name: G.Skill F4-2666C18S-16GRS 16GB DDR4 2666MHz SO-DIMM
Brand: G.Skill
SKU: F4-2666C18S-16GRS

Overview

The G.Skill F4-2666C18S-16GRS is a 16GB DDR4 SO-DIMM running at 2666MHz (PC4-21300) with CL18-18-18-43 timings and 1.2V operation — a spec profile that covers the practical needs of most laptop upgrade scenarios without overengineering for workloads the platform can't leverage. For a system bottlenecked by 4GB or 8GB of RAM, this single module represents one of the highest-impact upgrades available: more headroom for browser tabs, virtual machines, and simultaneous applications means less time waiting and less swap file thrashing on the storage drive.

The module occupies a single 260-pin SO-DIMM slot at a compact 30mm height, making it mechanically compatible with virtually every standard laptop chassis that accepts DDR4 memory. Installation is straightforward — no voltage modifications, no XMP profile activation required. It runs at rated spec by default. The primary engineering consideration for buyers is the single-channel configuration: one 16GB stick delivers less memory bandwidth than two 8GB sticks operating in dual-channel mode. For most office, productivity, and web workflows, the difference is negligible. For memory-bandwidth-sensitive workloads — video editing, large data processing, integrated GPU tasks — pairing two modules is worth the investment. For the right user in the right system, this is a clean, no-drama upgrade.

Key Features

DDR4-2666MHz (PC4-21300), CL18-18-18-43, 1.2 Volt, Non-ECC, 260 pin, Single Channel

Extreme Performance DDR4 Memory

Optimized compatibility with 6th Gen Intel Core Processors

1.2V Low Voltage Support

Module Height: 30mm / 1.18in

Specifications

Brand

G.Skill

Model

F4-2666C18S-16GRS

Capacity

16GB

Memory Type

DDR4 SO-DIMM

Speed

2666MHz (PC4-21300)

CAS Latency

CL18-18-18-43

Voltage

1.2V

Form Factor

260-pin SO-DIMM

Module Height

30mm / 1.18 in

Channel

Single Channel

ECC

Non-ECC

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Pros & Cons

👍 Pros

16GB capacity provides meaningful headroom for multitasking, browser-heavy workflows, and memory-hungry applications on a single module
2666MHz speed at 1.2V operates within DDR4 spec without requiring any BIOS configuration changes
30mm low-profile height fits standard laptop SO-DIMM slots without clearance concerns
Non-ECC design is appropriate for consumer and prosumer laptops where ECC is neither supported nor needed
Single module leaves a second slot open for future capacity expansion if the system supports it

👎 Cons

Single-channel configuration means you won't see the bandwidth gains of a dual-channel 2x8GB setup — memory-bandwidth-sensitive tasks will perform noticeably better with a matched pair
CL18 timing is on the looser end for DDR4-2666 — tighter kits exist at this speed for buyers who prioritize latency over cost
Locked to DDR4 — not compatible with DDR5 platforms or older DDR3 systems
No onboard heatspreader, which is standard for SO-DIMMs but means thermal management relies entirely on the laptop's airflow

Frequently Asked Questions

Will this module work in my laptop?

It's compatible with systems that accept a single 260-pin DDR4 SO-DIMM. It was specifically optimized for 6th Gen Intel Core platforms, but it also runs in most DDR4 SO-DIMM slots running at or below 2666MHz. Confirm your laptop's maximum supported speed and slot count before purchasing — the module will downclock to match your system's rated speed if needed.

Is this a single module or a matched pair?

This is a single 16GB module. It operates in single-channel mode on its own. If your laptop has two SO-DIMM slots and you want dual-channel bandwidth, you would need two modules installed together.

What does CL18 latency mean, and does it matter for everyday use?

CL18 means the module takes 18 clock cycles to respond to a read command. At 2666MHz, that translates to roughly 13.5 nanoseconds of latency — acceptable for general computing and productivity workloads. It's not optimized for ultra-low-latency workloads, but for the vast majority of users upgrading from slower or lower-capacity RAM, the capacity gain far outweighs the latency difference.

Does the 30mm module height cause clearance issues inside laptops?

At 30mm (1.18 inches), this module stays within the standard SO-DIMM height spec used in most laptops. Clearance issues are rare with standard SO-DIMM designs, but ultra-thin laptops with modified slot orientations may have restrictions — check your service manual if you're uncertain.

What voltage does this module require?

It runs at 1.2V, which is the standard DDR4 operating voltage. No modified voltage settings or BIOS adjustments are required.

G.Skill F4-2666C18S-16GRS 16GB DDR4 2666MHz SO-DIMM

Overview

Key Features

Specifications

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