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Four green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR5 4800 CL40 ECC RDIMM memory upgrade for Dell PowerEdge XE9640

SKU CH-22S0-B6DAJ

A 64 GB kit of four 16 GB DDR5 4800 CL40 ECC registered DIMMs built for the Dell PowerEdge XE9640 server

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 64 GB kit expands Dell PowerEdge XE9640 memory capacity
  • DDR5 4800 speed accelerates data-intensive server workloads
  • ECC registered design protects mission-critical data integrity
  • 10 V operation reduces power draw per module
  • 288-pin RDIMM form factor ensures direct slot compatibility

Dell PowerEdge XE9640 memory kit

This 64GB kit contains four 16GB DDR5 modules built for the Dell PowerEdge XE9640 rack server. Each stick runs at 4800 MT/s with CL40 latency and operates at 1.1V. The registered ECC design adds error correction and signal buffering for stable operation in multi-socket platforms.

Replaces slower or smaller DDR5 RDIMMs

The upgrade is worthwhile when the server currently runs below 4800 MT/s or has fewer than four populated slots. Moving to this speed and capacity reduces latency-bound stalls in memory-heavy workloads such as virtualization, database caching and HPC jobs.

Fits 288-pin DDR5 RDIMM slots on the XE9640

The modules require a motherboard that supports registered ECC DDR5 at 1.1V. No heat spreaders are fitted, so airflow across the DIMM area must be adequate. Populating all four channels frees the remaining slots for future expansion while delivering full bandwidth to the CPU memory controllers.

How it compares

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

Price $1,854.99
Pricier than about 67% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $28.98 per GB
Pricier than about 82% 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 numberMR38400-618K4
Total capacity64 GB (4 × 16 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 rank1Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsDell
In the box
Included items64 GB (4 × 16 GB) DDR5 4800 MHz PC5-38400 1Rx8 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will four 288-pin DDR5 RDIMMs fit the XE9640 memory slots?

Yes, each 16 GB module uses the standard 288-pin DDR5 RDIMM form factor that matches the XE9640 DIMM sockets.

What is the correct seating order for the 1Rx8 modules in the XE9640?

Populate the slots in the sequence shown in the Dell XE9640 service manual — typically one module per channel per CPU — and press until both ejector clips click.

How often should 1.1 V DDR5 ECC RDIMMs be replaced in a XE9640 deployment?

ECC RDIMMs have no scheduled replacement interval; monitor corrected-error counts in the BMC and swap any module that exceeds the platform threshold.

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