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Four bare green DDR5 RDIMM sticks, no heat spreaders

G.SKILL

G.SKILL F5-6400R3239G48GQ4-G5 192GB (4×48GB) DDR5 6400 CL32 ECC Registered server RAM

SKU CH-X4HJ-EJ40M MPN F5-6400R3239G48GQ4-G5

192 GB quad-channel DDR5 RDIMM kit running at 6400 MT/s with CL32 ECC registered stability for Xeon W790 workstations

  • Total capacity192 GB (4 × 48 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetIntel W790 Series Chipset (w/ Quad-Channel Memory Support)
  • CAS latencyCL32
  • Memory timings32-39-39-102
  • Rated voltage1.4 V
  • 192 GB quad-channel kit scales memory-heavy workloads
  • DDR5 6400 CL32 timing delivers high bandwidth
  • ECC Registered design protects data integrity
  • Intel XMP 3.0 profile simplifies overclock setup
  • 40 V operation balances speed and stability

G5 Series 192GB Quad-Channel Kit

The G.SKILL G5 Series provides 192GB of DDR5 registered memory in a 4×48GB configuration. It is built for Intel Xeon W-2400X workstations that require ECC error correction and quad-channel bandwidth. The modules operate at DDR5 6400 with CL32 timings and need a compatible Intel W790 motherboard.

Thermals and Power at 1.40V

Each RDIMM runs at 1.40V with a dedicated temperature sensor for monitoring. The kit uses hand-screened ICs tested for stability, and the registered buffer reduces electrical load on the memory controller. No heat spreaders are fitted, so chassis airflow must carry heat away from the bare modules.

Sustained Load Behaviour

On-die ECC and side-band ECC protect data integrity during extended rendering or compute sessions. Intel XMP 3.0 profiles apply the rated 32-39-39-102 timings at 6400 MT/s, though final stability depends on the CPU memory controller and motherboard QVL validation. Builders needing non-registered DIMMs or consumer chipset support should look elsewhere.

How it compares

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

Price $4,373.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 192 GB (4 × 48 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $22.78 per GB
Pricier than about 84% 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 nameF5-6400R3239G48GQ4-G5
Total capacity192 GB (4 × 48 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetIntel W790 Series Chipset (w/ Quad-Channel Memory Support)
Memory
CAS latencyCL32
Memory timings32-39-39-102
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Memory profilesIntel XMP 3.0
Heat spreaderNo
Power
Rated voltage1.4 V
Size & build
Shipping weight0.27 kg
Package size244 × 178 × 23 mm

Questions about this item

How do I install this 288-pin DDR5 RDIMM kit on an Intel W790 motherboard and what step is often missed?

Seat each 48GB module firmly until the retention clips click into the 288-pin slots, then enable the Intel XMP 3.0 profile in BIOS so the kit runs at DDR5 6400 CL32 instead of the default JEDEC speed.

What maintenance or replacement will this 192GB registered ECC kit need over time?

No routine maintenance is required; the on-die ECC and side-band ECC handle error correction automatically, and the dedicated temperature sensor allows the platform to throttle if needed, so replacement is only necessary if a module fails.

What limit appears first when this 1.40V quad-channel kit runs sustained workloads?

The 1.40V operating voltage combined with no heat spreader means thermal throttling via the dedicated temperature sensor is the first limit reached under prolonged heavy load.

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