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Four black DDR5 RDIMM modules in a quad-channel kit

G.SKILL

G.SKILL Zeta R5 Neo 128GB (4×32GB) DDR5 6400 CL32 ECC Registered Server RAM F5-6400R3239G32GQ4-ZR5NK

SKU CH-Z2AC-420CM MPN F5-6400R3239G32GQ4-ZR5NK

128 GB quad-channel DDR5 RDIMM kit running at 6400 MT/s with CL32 latency, ECC and AMD EXPO support for Threadripper workstations

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • CAS latencyCL32
  • Memory timings32-39-39
  • Rated voltage1.4 V
  • Buffer typeRegistered

Capacity 128GB (4 x 32GB)

Speed DDR5 6400 (PC5 51200)

  • 128 GB quad-channel capacity scales multi-threaded workloads
  • DDR5 6400 speed with CL32 timing accelerates data throughput
  • ECC registered design protects data integrity in critical tasks
  • AMD EXPO support simplifies overclock configuration on Threadripper 7000
  • On-die and side-band ECC enhance error correction coverage

Zeta R5 Neo DDR5 6400 RDIMM

This 128GB quad-channel kit uses four 32GB registered DDR5 modules rated at 6400 MT/s with CL32 timings. It delivers ECC error correction and on-die temperature sensors for data integrity. The kit targets high-end AMD workstation platforms that require registered memory.

Suits AMD Threadripper workstations

The kit is designed for AMD Ryzen Threadripper 7000X series processors on TRX50 motherboards with four-channel support. Builders using consumer CPUs, unbuffered memory slots, or boards lacking AMD EXPO support should choose a different kit.

Registered ECC at 1.40V

These RDIMMs operate at 1.40V with registered buffering and full ECC. Systems that only accept unbuffered non-ECC DIMMs or cannot supply the required voltage will not work with this memory.

How it compares

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

Price $755.99
Pricier than about 76% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.91 per GB
Cheaper than about 65% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameG.SKILL
Product lineZeta R5 Neo series
Model nameF5-6400R3239G32GQ4-ZR5NK
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Memory
CAS latencyCL32
Memory timings32-39-39
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Power
Rated voltage1.4 V
Size & build
Shipping weight0.23 kg
Package size244 × 178 × 24 mm

Other versions of this model

4 more in the same range

Questions about this item

What motherboard slot and channel layout does this 288-pin DDR5 RDIMM kit require?

The kit uses 288-pin DDR5 RDIMM modules and needs a compatible AMD TRX50 motherboard with 4-channel support to run as a quad-channel kit.

How is AMD EXPO enabled on this 6400 CL32 kit, and what step is often missed?

Enable the AMD EXPO profile in the motherboard BIOS after installing all four 32GB modules; the step often missed is confirming the profile applies the 1.40V voltage and 32-39-39 timings.

What long-term checks do the dedicated temperature sensors on these modules support?

The on-module temperature sensors allow ongoing thermal monitoring so you can verify cooling performance and detect any degradation over the memory's service life.

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