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Two green DDR5 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM RS720-E11-RS24U 256GB (2x128GB) DDR5 4800 PC5-38400 ECC RDIMM memory upgrade

SKU CH-990V-8TDYB MPN RS720-E11-RS24U

Registered DDR5 ECC RDIMM kit adds 256 GB across two 128 GB modules at 4800 MT/s CL40 for compatible ASUS dual-socket servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity with two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered design detects and corrects data errors
  • Low 1.10 V operating voltage reduces power draw
  • Validated for ASUS RS720-E11-RS24U 2U dual-socket server

System-Specific DDR5 Kit

This 256GB kit contains two 128GB DDR5 4800 registered ECC RDIMMs built for the ASUS RS720-E11-RS24U 2U dual-socket server. It targets administrators who need maximum capacity per slot in that platform. The modules are not compatible with consumer motherboards or systems that require unbuffered memory.

Thermals and Power

Each module operates at 1.10V with a CL40 latency and a 4Rx4 organisation. The registered buffer and on-die ECC add negligible latency overhead while correcting single-bit errors in flight. No heat spreader is fitted, so airflow across the DIMM slots must follow the server chassis design.

What the Kit Changes

The matched pair populates two slots with 256GB total, letting the RS720-E11-RS24U reach higher memory ceilings for virtualisation or in-memory databases. Registered signalling and ECC protect data integrity under sustained load. No additional software or accessories are included beyond the two modules.

How it compares

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

Price $7,020.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $27.43 per GB
Pricier than about 76% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASUS Server Motherboard Compatible Series Memory
Model nameASUS DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K2
Total capacity256 GB (2 × 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 systemsASUS
In the box
Included items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How do I install these 288-pin DDR5 RDIMMs in the ASUS RS720-E11-RS24U server, and what step is often missed?

Power down the server, open the chassis, and seat each 128 GB module firmly until the ejector clips lock; the step often missed is confirming the BIOS recognises both 4Rx4 ranks at 4800 MT/s before closing the case.

What maintenance or replacement will this 256 GB ECC registered kit need over its service life?

The modules have no moving parts and no heat spreaders, so routine maintenance is limited to keeping server airflow clean; replacement is only required if a module fails, which is covered by the manufacturer's lifetime replacement warranty.

What limit appears first when the memory runs sustained workloads at 1.1 V?

The primary limit is the CL40 latency at 4800 MT/s; sustained throughput is bounded by the DDR5 38400 transfer rate and the registered buffer, not by thermal throttling, since the RDIMMs operate without heat spreaders.

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