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Four green DDR5 ECC RDIMM modules in a row

OWC

OWC 256GB (4x64GB) DDR5 4800 CL40 ECC RDIMM 2Rx4 1.1V memory upgrade

SKU CH-X0JC-G004A

ECC registered DDR5 kit adds 256 GB across four 64 GB modules at 4800 MT/s CL40 for compatible Lenovo ThinkSystem servers

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 256GB (4 x 64GB)

  • 256 GB total capacity from four 64 GB modules
  • DDR5 4800 speed with CL40 latency at 1.1 V
  • ECC registered design protects data integrity in servers
  • 2Rx4 dual-rank organisation increases memory density per slot
  • Validated for Lenovo ThinkSystem SD650 V3 SD650-I V3 SD665 V3 SD665-N V3 SR630 V3

Server-grade DDR5 upgrade kit

This 256 GB kit contains four 64 GB DDR5 4800 ECC registered RDIMMs built for Lenovo ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 servers. It is designed for administrators who need error-correcting, registered memory in a 288-pin form factor and cannot use standard desktop modules. The kit will not work in consumer motherboards or alongside unbuffered or load-reduced DIMMs.

Thermals and power profile

Operating at 1.1 V, the modules follow the JEDEC DDR5 baseline for registered server memory. No heat spreaders are fitted, so airflow through the server chassis provides all cooling. Power draw scales with the 4800 MT/s data rate and the 2Rx4 organisation, matching the thermal envelope expected by the qualified ThinkSystem platforms. Acoustic impact is limited to the existing system fans.

Compliance and support difference

JEDEC and RoHS compliance means the upgrade preserves the original server warranty. OWC adds an advanced replacement programme and lifetime technical support, so a failed module can be swapped without waiting for a standard RMA. The package contains only the four DIMMs; no cables, brackets or software utilities are included.

How it compares

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

Price $5,261.99
Pricier than about 80% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $20.55 per GB
Pricier than about 66% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R4256S
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkSystem SD650 V3
Lenovo ThinkSystem SD650-I V3
Lenovo ThinkSystem SD665 V3
Lenovo ThinkSystem SD665-N V3
Lenovo ThinkSystem SR630 V3

Other versions of this model

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Questions about this item

How do I install the four 64GB DDR5 4800 CL40 ECC RDIMMs in a ThinkSystem SR630 V3, and what step is often missed?

Power down the server, open the chassis, align each 288-pin module with its slot, press firmly until the ejector tabs click, then verify in BIOS that all 256GB are detected at 4800 MT/s; the step often missed is seating every module fully so both tabs lock.

What maintenance or replacement will the 2Rx4 registered ECC modules need during their service life?

The modules have no moving parts or heat spreaders; apart from keeping server air filters clean to maintain airflow, no scheduled maintenance is required, and replacement is only needed if a module fails ECC correction or the platform is upgraded beyond DDR5 4800.

What limit appears first when the kit runs sustained workloads in a ThinkSystem SD650 V3?

The registered DDR5 4800 CL40 specification caps bandwidth at 38400 MB/s per module, so sustained throughput hits the JEDEC speed ceiling before thermal throttling becomes a factor at the standard 1.1V operating voltage.

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