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Two green DDR5 RDIMM modules, bare boards with gold contacts

NEMIX RAM

NEMIX RAM 128GB (2x64GB) DDR5 4800 ECC RDIMM 2Rx4 CL40 1.1V 288-Pin Dell PowerEdge XE9640 memory upgrade

SKU CH-28EA-TP7AJ

128 GB DDR5 ECC registered server memory kit, two 64 GB modules at 4800 MT/s with CL40 latency and 1.1 V operation for Dell PowerEdge XE9640

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128 GB total capacity from two 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered RDIMM protects data integrity
  • 2Rx4 dual-rank organisation optimises density
  • 1 V operation at CL40 latency for Dell PowerEdge XE9640

Dell PowerEdge XE9640 server memory upgrade

This 128 GB kit uses two 64 GB DDR5 4800 ECC registered DIMMs built for the Dell PowerEdge XE9640 rack server. Each module runs at 1.1 V with CL40 latency and a 2Rx4 organisation. The registered buffer and on-die ECC protect data integrity in multi-socket workloads.

288-pin RDIMM kit for registered DDR5 slots

The modules install directly into the server’s 288-pin DDR5 RDIMM sockets and require a platform that supports registered ECC memory. Two slots are consumed, leaving remaining channels free for further capacity expansion. No heat spreader is fitted, so airflow across the bare PCB is required.

1.1 V operation at DDR5 4800 speed

Standard JEDEC 1.1 V voltage keeps power draw low while delivering PC5-38400 bandwidth. Registered buffering adds minimal latency and reduces electrical load on the memory controller. With no onboard thermal solution, system fans must move enough air to keep the modules within spec under sustained load.

How it compares

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

Price $3,584.99
Pricier than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $28.01 per GB
Pricier than about 78% 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 numberMR38400-924K2
Total capacity128 GB (2 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell
In the box
Included items128 GB (2 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the CL40 latency become a bottleneck during sustained workloads?

CL40 is the rated CAS latency for these DDR5 4800 modules; actual sustained throughput depends on the Dell PowerEdge XE9640 memory controller and workload mix.

What thermal or power behaviour should be expected when the kit runs continuously at 1.1V?

The modules operate at 1.1V without heat spreaders; thermals are managed by the server chassis airflow and the registered buffer reduces electrical load on the memory bus.

Which server configuration is required before installing this 2Rx4 registered ECC kit?

The kit is validated for Dell PowerEdge XE9640 systems that support DDR5 4800 registered ECC RDIMMs in a 288-pin slot population.

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