We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Eight bare green DDR5 RDIMM modules in a row

G.SKILL

G.SKILL F5-6400R3239G32GE8-G5 256GB (8×32GB) DDR5 6400 CL32 ECC Registered server RAM

SKU CH-4XZW-KB5BX MPN F5-6400R3239G32GE8-G5

Eight 32 GB DDR5 RDIMMs deliver 256 GB of registered ECC memory at 6400 MT/s with CL32 timing for Intel Xeon W-3400X workstations

  • Total capacity256 GB (8 × 32 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
  • 256 GB octa-channel kit scales memory-intensive workloads
  • DDR5 6400 speed delivers high bandwidth for demanding tasks
  • CL32 32-39-39-102 timings balance latency and throughput
  • ECC Registered design protects data integrity in servers
  • Intel XMP 3.0 profile enables one-click overclock configuration

G5 Series 256GB DDR5 RDIMM Kit

This G.SKILL G5 Series kit delivers 256GB across eight 32GB DDR5 RDIMM modules. It is built for workstations that require registered ECC memory and eight-channel bandwidth. Systems without an Intel W790 motherboard cannot use this kit.

Intel W790 Octa-Channel Requirement

The decisive specification is the Intel W790 chipset with eight-channel memory support. Only motherboards that expose eight DDR5 channels and the Xeon W-3400X processor family can activate the rated DDR5 6400 speed and XMP 3.0 profile. Fewer channels or a different chipset will not run this kit at specification.

Sustained Load Behaviour

Hand-screened ICs and individual module testing target stability during extended rendering or compute sessions. The 1.40V operating voltage and registered buffer help maintain signal integrity across all eight channels under continuous load. No heat spreader is fitted, so chassis airflow must dissipate the thermal output of the dense 256GB configuration.

How it compares

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

Price $10,243.99
Pricier than about 91% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $40.02 per GB
Pricier than about 90% 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 lineG5 Series
Model nameF5-6400R3239G32GE8-G5
Total capacity256 GB (8 × 32 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 weight0.41 kg
Package size248 × 178 × 36 mm

Questions about this item

What does the DDR5 6400 rating mean for actual throughput in an eight-channel workstation?

The kit runs at 6400 MT/s with CL32-39-39-102 timings at 1.40V; real-world bandwidth depends on the CPU memory controller and motherboard trace layout.

How does Intel XMP 3.0 work with registered ECC modules on a W790 platform?

XMP 3.0 stores the 6400 MT/s profile on the DIMM; the W790 chipset reads it at boot and applies the voltage and timings if the Xeon W-3400X IMC supports the frequency.

Will these 288-pin RDIMMs fit a standard workstation board with eight slots?

Yes, each module is a standard-height 288-pin DDR5 RDIMM without a heat spreader, so they install in any eight-slot W790 motherboard that lists this kit on its QVL.

More in ECC Server RAM

Similar items