G.Skill

G.Skill F5-7800J3646H16G 16GB

Summary:: 16GB DDR5 Desktop RAM Module

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Manufacturer: G.Skill Last updated: 2026-09-14

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G.Skill F5-7800J3646H16G 16GB Review

This single 16GB G.Skill module runs an extreme DDR5-7800 CL36

we'd only recommend this to Intel builders with a board proven at this speed. CL36 at 7800MT/s works out to 9.2ns true latency, ahead of AM5's 6000MT/s sweet spot, but 7800MT/s is well beyond what any current AM5 platform holds at a 1:1 fabric ratio, so the latency advantage never actually shows up on Ryzen.

Performance

CL36 at 7800MT/s computes to 9.2ns true latency, among the tightest in this catalog at this speed tier, ahead of the 10.0ns a 6000MT/s CL30 kit like the G.Skill Trident Z5 Neo RGB F5-6000J2636G32G delivers.

Compatibility

7800MT/s is extreme-tier DDR5 that needs a proven high-end Intel board and a strong CPU memory controller sample; check the specific board's QVL closely. On AM5 this speed falls well outside the 1:1 fabric-ratio range most boards hold, so expect a 2:1 fallback there rather than the rated performance.

Comparison to Alternatives

Against the G.Skill Trident Z5 RGB F5-8000J3848H16G at 8000MT/s CL38, that part trades a slightly looser CAS number for more raw bandwidth at the same 16GB capacity; both need the same tier of validated Intel board, so pick based on which rated speed your board's QVL actually confirms.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Best for

High-end Intel builds with boards specifically validated at 7800MT/s+
Enthusiast benchmarking or bandwidth-sensitive workstation workloads

Not for

AM5 builds, where this speed is far outside the efficient ratio range
Mainstream or budget builds where a 6000MT/s kit is more than sufficient

Specifications

What these specs mean

Speed Score

9.8/10

How fast this kit is among DDR5 kits, rated from its speed and latency.

Identity

Peak Bandwidth	62.4 GB/s
Brand	G.Skill
Part Number	F5-7800J3646H16G

Memory

DDR Generation	DDR5
Capacity	16 GB
Speed	7800 MT/s
CAS Latency	36
Module Count	1

Physical

RGB Lighting	Yes

Module and platform

RAM Segment	Desktop DDR5
Form Factor	Desktop DIMM
Platform Optimisation	Intel

Capacity

Capacity Per Module	16 GB

Speed and timings

True Latency	9.2 ns

Overclocking profile

XMP Support	Yes
XMP Version	XMP 3.0
EXPO Support	No

FAQs

What are the key specifications of the G.Skill F5-7800J3646H16G 16GB?

Key specs for the G.Skill F5-7800J3646H16G 16GB: Capacity Per Module 16 GB, Capacity 16 GB, Speed 7800 MT/s, OC Profile XMP 3.0, DDR Generation DDR5, Part Number F5-7800J3646H16G.

Will the G.Skill F5-7800J3646H16G 16GB work with my current setup?

The G.Skill F5-7800J3646H16G 16GB lists DDR Generation is DDR5. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.

Who is the G.Skill F5-7800J3646H16G 16GB best suited to?

Best suited to: High-end Intel builds with boards specifically validated at 7800MT/s+; Enthusiast benchmarking or bandwidth-sensitive workstation workloads.

What are the drawbacks of the G.Skill F5-7800J3646H16G 16GB?

Not the best fit for: AM5 builds, where this speed is far outside the efficient ratio range; Mainstream or budget builds where a 6000MT/s kit is more than sufficient.