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G.SKILL Ripjaws S5 Series DDR5 RAM (Intel XMP 3.0) 128GB (2x64GB) Up to 6400MT/s CL36-44-44-102 1.35V Desktop Computer Memory U-DIMM - Matte Black (F5-6400J3644F64GX2-RS5K)
G.SKILL

G.SKILL Ripjaws S5 Series DDR5 RAM (Intel XMP 3.0) 128GB (2x64GB) Up to 6400MT/s CL36-44-44-102 1.35V Desktop Computer Memory U-DIMM - Matte Black (F5-6400J3644F64GX2-RS5K)

Bottom line: The G.SKILL Ripjaws S5 Series DDR5 RAM is a specs-and-price decision rather than a crowd-consensus one in the memory (ram) category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For desktop and laptop memory upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ G.SKILL Ripjaws S5 Series DDR5 U-DIMM Memory Kit, Model: F5-6400J3644F64GX2-RS5K
  • ✓ Backed by G.SKILL's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

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SpecPicks Verdict

SpecPicks scored G.SKILL Ripjaws S5 Series DDR5 RAM (Intel XMP 3.0) 128GB (2x64GB) Up… using a rating × review-volume × price-fit model applied to published specs and reviews across the memory (ram) category. G.SKILL's memory (ram) lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory (ram) of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • G.SKILL Ripjaws S5 Series DDR5 U-DIMM Memory Kit, Model: F5-6400J3644F64GX2-RS5K
  • 128GB total capacity kit containing 2x64GB modules, rated for up to DDR5-6400 CL36-44-44-102 at 1.35V (Requires motherboard BIOS update, dated 2025 or newer with 64GB module support.)
  • Non-ECC, DDR5 U-DIMM, 288-pin, for Desktop PC & Gaming
  • Includes JEDEC default profile, and Intel XMP 3.0 memory overclock profile
  • Do not mix memory kits. Memory kits are sold in matched kits that are designed to run together as a set. Mixing memory kits will result in stability issues or system failure.
  • Refer to G.SKILL memory QVL or RAM Configurator tool on the G.SKILL website for more details on validated motherboard and hardware.

Full Specifications

BrandG.SKILL
Voltage1.35 volts
RAM Size128 GB
Model NameRipjaws S5
Unit Count2 Count
Form FactorDIMM
Memory Speed6000 mt_s
CompatibilityPC
Number of Pins288
Number of Items2
Memory GenerationDDR5
Compatible DevicesDesktop
Data Transfer Rate6000 megabits_per_second
Memory Form FactorDIMM, UDIMM
Additional FeaturesINTEL XMP 3.0
Computer Memory Size128 GB
Warranty DescriptionLimited Lifetime Manufacturer
RAM Memory TechnologyDDR5
Column Address Strobe LatencyCL36

Ready to buy?

G.SKILL Ripjaws S5 Series DDR5 RAM (Intel XMP 3.0) 128GB (2x64GB) Up to 6400MT/s CL36-44-44-102 1.35V Desktop Computer Memory U-DIMM - Matte Black (F5-6400J3644F64GX2-RS5K) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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G.SKILL Ripjaws S5 Series DDR5 RAM (Intel XMP 3.0) 128GB (2x64GB) Up to 6400MT/s CL36-44-44-102 1.35V Desktop Computer Memory U-DIMM - Matte Black (F5-6400J3644F64GX2-RS5K)
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