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Four green DDR5 RDIMM modules, no heat spreaders, 288 pins, 512GB kit

NEMIX RAM

NEMIX RAM 512GB (4 x 128GB) DDR5 4800 CL40 ECC RDIMM Dell PowerEdge XE8640 memory upgrade

SKU CH-SJY9-9ZRXQ

A 512 GB registered DDR5 kit with ECC, CL40 latency and 1.1 V operation for Dell PowerEdge XE8640 servers

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Massive 512 GB capacity from four 128 GB modules
  • DDR5 4800 speed delivers high bandwidth for demanding workloads
  • ECC registered design protects data integrity in critical applications
  • Low 1.1 V operation reduces power draw and heat
  • Validated for Dell PowerEdge XE8640 server compatibility

512GB DDR5 ECC RDIMM kit for Dell PowerEdge XE8640

This 512GB kit contains four 128GB DDR5 4800 registered DIMMs built with ECC and a 4Rx4 organisation. It is designed for administrators upgrading a Dell PowerEdge XE8640 rack server that requires registered error-correcting memory.

Registered 288-pin modules at 1.1V without heat

Each module uses the standard 288-pin DDR5 RDIMM form factor and operates at 1.10V. The absence of heat spreaders keeps the profile low for dense server chassis, while the registered buffer reduces electrical load on the memory controller.

CL40 latency at DDR5 4800 (PC5-38400)

The kit runs at 4800 MT/s with a CAS latency of 40, matching the PC5-38400 specification. This timing is the decisive figure for compatibility with the XE8640 memory subsystem.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $16,208.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $31.66 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineDell Server/Workstation Compatible Series Memory
Model nameDell DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K4
Total capacity512 GB (4 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell
In the box
Included items512 GB (4 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the DDR5 4800 PC5-38400 standard cap the maximum data rate at 4800 MT/s?

Yes, the modules run at DDR5 4800 (PC5-38400), so the peak transfer rate is limited to that speed class.

What physical slot and module height does the 288-pin RDIMM kit require?

Each 128 GB module uses a standard 288-pin DDR5 RDIMM form factor with no heat spreader, fitting regular server DIMM sockets.

Which population sequence avoids the common mis-seating error on the PowerEdge XE8640?

Install the four 4Rx4 modules in the identical slots per channel shown in the XE8640 service manual, pressing straight down until both ejectors click.

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