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Eight bare green DDR5 RDIMM modules in anti-static tray

G.SKILL

G.SKILL F5-6400R3239G16GE8-G5 128GB (8 x 16GB) DDR5 6400 CL32 ECC Registered server RAM

SKU CH-CS9P-85P1M MPN F5-6400R3239G16GE8-G5

Eight 16 GB DDR5 registered ECC modules at 6400 MT/s with CL32 timing for Intel Xeon W-3400X workstations

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetIntel W790 Series Chipset (w/ Octo-Channel Memory Support)
  • CAS latencyCL32
  • Memory timings32-39-39-102
  • Rated voltage1.4 V
  • 128 GB octa-channel kit scales memory bandwidth for heavy workloads
  • DDR5 6400 MT/s rated speed feeds data to Xeon cores faster
  • CL32 32-39-39-102 timings tighten latency for responsive compute
  • ECC registered design corrects errors and stabilises signal integrity
  • Intel XMP 3.0 profile enables rated overclock with one BIOS setting

Workstation DDR5 RDIMM kit

This G.SKILL G5 Series kit provides 128GB across eight 16GB DDR5 RDIMM modules. It targets professionals building Intel Xeon W-3400X workstations on W790 motherboards with eight-channel support. Registered operation and on-die plus side-band ECC protect data integrity in memory-intensive workloads.

Replaces standard JEDEC memory

The kit upgrades from baseline DDR5 speeds to DDR5 6400 (PC5 51200) with CL32-39-39-102 timings at 1.40V via Intel XMP 3.0. The jump is worthwhile when your W790 platform can run the XMP profile and your applications benefit from the extra bandwidth over standard registered DIMMs.

Sustained-load behaviour

Hand-screened ICs and individual module testing aim to keep the rated frequency and timings stable during extended rendering or compute sessions. A dedicated temperature sensor on each DIMM allows the platform to monitor thermal status under continuous load. No heat spreaders are fitted, so chassis airflow must handle the 1.40V operating voltage.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $4,712.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $36.82 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameG.SKILL
Product lineG5 Series
Model nameF5-6400R3239G16GE8-G5
Total capacity128 GB (8 × 16 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetIntel W790 Series Chipset (w/ Octo-Channel Memory Support)
Memory
CAS latencyCL32
Memory timings32-39-39-102
ECC supportYes
Buffer typeRegistered
Kit configurationOcta Channel Kit
Memory profilesIntel XMP 3.0
Heat spreaderNo
Power
Rated voltage1.4 V
Size & build
Shipping weight0.17 kg
Package size244 × 178 × 36 mm

Questions about this item

What motherboard slot and pin count do the 288-pin DDR5 RDIMMs require?

The modules use the standard 288-pin DDR5 RDIMM form factor and must be installed in a motherboard with matching DDR5 RDIMM slots.

How is the Intel XMP 3.0 profile enabled on the octa-channel kit?

Enter the BIOS on a compatible Intel W790 motherboard, select the XMP 3.0 profile, save and reboot; the rated 6400 MT/s speed and 32-39-39-102 timings apply only when XMP is active.

When should the registered ECC modules be reseated or replaced in a continuous-workstation?

Reseat if the system reports corrected ECC errors or fails to POST after thermal cycles; replace modules that show persistent uncorrectable errors or physical damage.

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