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Two black low-profile DDR5 modules with matte aluminum heatspreaders

G.SKILL

G.SKILL F5-6400J3644F64GX2-RS5K 128GB (2×64GB) DDR5 6400 CL36 desktop RAM

SKU CH-JPYM-2PYAX MPN F5-6400J3644F64GX2-RS5K

128 GB dual-channel DDR5 kit at 6400 MT/s with CL36 timings and a 33 mm low-profile heat spreader

  • Capacity128GB (2 x 64GB)
  • Type288-Pin PC RAM
  • SpeedDDR5 6400 (PC5 51200)
  • CAS LatencyCL36
  • Timing36-44-44-102
  • Voltage1.35V
  • 128GB capacity supports heavy multitasking and large datasets
  • 6400 MT/s data rate delivers high memory bandwidth
  • CL36 latency with 36-44-44-102 timings balances speed and responsiveness
  • 33mm low-profile height clears large CPU coolers
  • Intel XMP 3.0 profile enables one-click overclocking

Ripjaws S5 128GB DDR5 Kit

This 128GB kit contains two 64GB DDR5 modules rated at 6400 MT/s with CL36 timing. The low-profile 33mm height suits compact builds and large CPU coolers. Hand-screened ICs and Intel XMP 3.0 support target enthusiasts and gamers on compatible Intel 600, 700 and 800 series platforms.

Thermals and Power at 1.35V

Aluminum heatspreaders on each module move heat away from the hand-screened ICs during sustained workloads. The 1.35V operating voltage keeps power draw modest for a DDR5-6400 kit. No onboard LEDs mean zero extra lighting power or software control overhead.

What XMP 3.0 Changes

Enabling the Intel XMP 3.0 profile in BIOS automatically sets 6400 MT/s, 36-44-44-102 timings and 1.35V without manual tuning. The dual-channel 2×64GB configuration delivers 128GB total capacity for memory-intensive tasks. No additional software or drivers are required beyond the motherboard firmware.

Highlights

  • 128GB capacity supports heavy multitasking and large datasets
  • 6400 MT/s data rate delivers high memory bandwidth
  • CL36 latency with 36-44-44-102 timings balances speed and responsiveness
  • 33mm low-profile height clears large CPU coolers
  • Intel XMP 3.0 profile enables one-click overclocking

Specifications

BrandG.SKILL
SeriesRipjaws S5 Series
ModelF5-6400J3644F64GX2-RS5K
Capacity128GB (2 x 64GB)
Type288-Pin PC RAM
SpeedDDR5 6400 (PC5 51200)
CAS LatencyCL36
Timing36-44-44-102
Voltage1.35V
Multi-channel KitDual Channel Kit
BIOS/Performance ProfileIntel XMP 3.0
ColorBlack
Heat SpreaderYes
FeaturesRipjaws S5 series is a low-profile height DDR5 memory made with quality hand-screened
memory ICs, and designed for compatible DDR5-enabled Intel platforms.
Available in matte black or matte white aluminum heatspreaders, Ripjaws S5 is an excellent
memory choice for enthusiasts, gamers, and modders who are looking for an ideal balance of
speed and style.
• High-speed overclock performance DDR5 memory
• 33mm Low-profile module height design
• Intel XMP 3.0 Support
Recommend UseHigh Performance or Gaming Memory / Intel 600 Series / Intel 700 Series / Intel 800 Series / Intel B660 / Intel B670 / Intel B760 / Intel Compatible / Intel Z690 / Intel Z790 / Intel Z890
LED ColorNone
Shipping weight0.14 kg
Package size229 × 152 × 19 mm

Questions about this item

How do I install the 288-pin DDR5 modules in the correct dual-channel slots and what step is commonly missed?

Align the notch on each 288-pin module with the slot key, press firmly until the retention clips click, then enable the Intel XMP 3.0 profile in BIOS so the kit runs at DDR5 6400 CL36 instead of the default JEDEC speed.

What maintenance will the Ripjaws S5 heatspreaders and memory ICs need over time?

The low-profile 33 mm aluminum heatspreaders are passive; periodically remove dust with compressed air to maintain thermal performance — no liquid cooling, thermal paste replacement or IC servicing is required.

What limit appears first when the 128 GB kit runs sustained workloads at 1.35 V?

The primary limit is thermal — the 33 mm heatspreaders rely on case airflow, so prolonged heavy loads can throttle speeds if chassis ventilation is insufficient.

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