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Four bare green DDR5 RDIMM modules, no heat spreaders

G.SKILL

G.SKILL F5-6400R3239G16GQ4-G5N 64GB (4×16GB) DDR5 6400 CL32 ECC Registered server RAM

SKU CH-15Q8-XW36E MPN F5-6400R3239G16GQ4-G5N

64 GB quad-channel DDR5-6400 CL32 ECC RDIMM kit for AMD Threadripper 7000X workstations

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetAMD TRX50 Chipset
  • CAS latencyCL32
  • Memory timings32-39-39-102
  • Rated voltage1.4 V
  • 64 GB quad-channel capacity scales memory bandwidth for heavy workloads
  • DDR5 6400 speed with CL32 latency accelerates data-intensive tasks
  • ECC registered design protects data integrity in critical applications
  • AMD EXPO profile enables one-click overclock on Threadripper 7000X systems
  • 40 V operation balances high frequency with stable power draw

Server-grade DDR5 kit

This 64 GB kit contains four 16 GB registered DDR5 modules rated at 6400 MT/s with CL32-39-39-102 timings at 1.40 V. It targets workstations built on AMD Ryzen Threadripper 7000X series processors and TRX50 motherboards that provide quad-channel memory support. On-die and side-band ECC protect data integrity for professional workloads.

Registered modules without spreaders

Each 288-pin RDIMM uses a register to reduce electrical load on the memory controller, a requirement for stable four-channel operation at this speed. The absence of heat spreaders keeps module height low for dense server chassis, but airflow across the bare PCB must be adequate to manage thermals during sustained loads.

AMD EXPO profile dependence

Rated performance is reached only when the motherboard firmware enables the AMD EXPO profile and the CPU integrated memory controller can sustain the frequency. Without a compatible TRX50 platform and validated QVL entry, the kit will fall back to standard JEDEC speeds. Buyers who cannot confirm motherboard and CPU support for DDR5-6400 EXPO should not expect the advertised timings.

How it compares

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

Price $1,930.99
Pricier than about 86% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $30.17 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 Neo Series
Model nameF5-6400R3239G16GQ4-G5N
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetAMD TRX50 Chipset
Memory
CAS latencyCL32
Memory timings32-39-39-102
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Memory profilesAMD EXPO
Heat spreaderNo
Power
Rated voltage1.4 V
Size & build
Shipping weight0.12 kg
Package size244 × 178 × 25 mm

Questions about this item

Does DDR5 6400 run at 6400 MT/s on an AMD TRX50 platform with EXPO?

Yes, the kit is rated DDR5 6400 (PC5 51200) and uses an AMD EXPO profile to configure the 6400 MT/s speed on compatible TRX50 motherboards with Threadripper 7000X CPUs.

What physical slot and form factor do these modules require?

Each module is a 288-pin DDR5 RDIMM; the kit contains four 16 GB sticks that install in the four DDR5 RDIMM slots of a quad-channel TRX50 motherboard.

How is the EXPO profile enabled, and what step is often missed?

Enter the BIOS after installing all four modules, select the AMD EXPO profile for this kit, save and reboot; the step often missed is confirming the motherboard QVL lists this exact model before purchase.

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