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Eight silver DDR5 RDIMM sticks in a row

G.SKILL

G.SKILL F5-6400R3239G16GE8-ZR5K 128GB (8 x 16GB) DDR5 6400 CL32 ECC Registered Server RAM

SKU CH-3PFQ-EFR69 MPN F5-6400R3239G16GE8-ZR5K

128 GB octo-channel DDR5 RDIMM kit with ECC registered operation at 6400 MT/s, CL32 latency and 1.40 V for Xeon W-3400X workstations

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • CAS latencyCL32
  • Memory timings32-39-39
  • Rated voltage1.4 V
  • Buffer typeRegistered

Capacity 128GB (8 x 16GB)

Speed DDR5 6400 (PC5 51200)

  • 128GB octo-channel kit scales workstation capacity
  • DDR5 6400 CL32 timing accelerates data throughput
  • ECC registered design protects critical workload integrity
  • Intel XMP 3.0 profiles simplify overclock configuration
  • Optimised for Xeon W-3400X and W790 platforms

Zeta R5 DDR5-6400 Octo-Channel Kit

This 128 GB kit contains eight 16 GB RDIMMs rated at DDR5 6400 with CL32 timing. It targets professional workstations that need registered ECC memory and support Intel XMP 3.0 profiles for validated overclocking headroom.

Requires Intel W790 Chipset Eight-Channel Board

The modules operate at 1.40 V and use the standard 288-pin DDR5 RDIMM form factor. A compatible motherboard with eight populated channels is mandatory; systems with fewer channels or consumer chipsets cannot use this kit.

Sustained Loads with On-Die and Side-Band ECC

Registered buffering and dual ECC layers maintain data integrity during continuous compute tasks. Dedicated temperature sensors allow the platform to monitor thermal behaviour over extended periods without throttling surprises.

How it compares

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

Price $992.99
Pricier than about 80% 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 $7.76 per GB
Pricier than about 55% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameG.SKILL
Product lineZeta R5 Series
Model nameF5-6400R3239G16GE8-ZR5K
Total capacity128 GB (8 × 16 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Memory
CAS latencyCL32
Memory timings32-39-39
ECC supportYes
Buffer typeRegistered
Kit configurationOcto Channel Kit
Power
Rated voltage1.4 V
Size & build
Shipping weight0.41 kg
Package size244 × 178 × 38 mm

Other versions of this model

2 more in the same range

Questions about this item

What is the maximum sustained speed before the 1.40V voltage limit becomes the bottleneck?

The kit runs at DDR5 6400 (PC5 51200) with CL32 32-39-39 timings at 1.40V; pushing frequency higher would require more voltage than the rated 1.40V.

How much heat do the eight 16GB modules produce when running all day at DDR5 6400?

Each RDIMM includes on-die ECC, side-band ECC and dedicated temperature sensors to manage thermals during continuous workloads.

Which motherboard chipset and CPU must I already have for this octo-channel kit to function?

It requires an Intel W790 chipset motherboard with eight-channel support and an Intel Xeon W-3400X series processor.

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