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Eight green DDR5 RDIMM sticks with gold contacts in a row

OWC

OWC 1TB (8×128GB) DDR5 4800 CL40 4Rx4 ECC RDIMM memory upgrade

SKU CH-D29Y-70BRG

Eight 128 GB DDR5 4800 CL40 ECC registered DIMMs deliver 1 TB for Lenovo ThinkSystem SR675 V3, SR850 V3, SR860 V3 and ST650 V3 servers

  • Capacity1TB (8 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 1TB (8 x 128GB)

  • 1TB total capacity across 8×128GB modules
  • DDR5 4800 speed with CL40 latency
  • ECC registered design for data integrity
  • 1V operation reduces power draw
  • Qualified for ThinkSystem SR675 V3, SR850 V3, SR860 V3, ST650 V3

Server ECC RDIMM kit

This OWC kit supplies 1 TB of DDR5 registered ECC memory as eight 128 GB modules. It is built for Lenovo ThinkSystem SR675 V3, SR850 V3, SR860 V3 and ST650 V3 servers that require registered DIMMs.

Registered ECC requirement

The modules are 4Rx4 registered ECC RDIMMs running at DDR5 4800 CL40 and 1.1 V. They will not work in systems that accept only unbuffered or load-reduced memory, so the platform must support registered ECC.

For ThinkSystem upgrades

Suitable for administrators expanding memory in the listed ThinkSystem models. Buyers needing unbuffered DIMMs, consumer desktop memory or a different capacity per module should look elsewhere.

Highlights

  • 1TB total capacity across 8×128GB modules
  • DDR5 4800 speed with CL40 latency
  • ECC registered design for data integrity
  • 1V operation reduces power draw
  • Qualified for ThinkSystem SR675 V3, SR850 V3, SR860 V3, ST650 V3

Specifications

BrandOWC
Part Number4R8D54R41TBK
Capacity1TB (8 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR675 V3
Lenovo ThinkSystem SR850 V3
Lenovo ThinkSystem SR860 V3
Lenovo ThinkSystem ST650 V3

Other versions of this model

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Questions about this item

What does the 4800 MT/s speed mean once the modules are installed in a ThinkSystem server?

The kit runs at the JEDEC-standard DDR5 4800 data rate with CL40 timing, delivering the rated throughput on the supported Lenovo platforms without overclocking.

What does the PC5-38400 designation cap in practice?

PC5-38400 is the JEDEC label for DDR5 4800; the registered buffer and on-die ECC operate within that spec, so bandwidth and latency stay at the standard ceiling.

What physical slot and clearance do these 128 GB RDIMMs need?

Each module is a 288-pin DDR5 RDIMM without a heat spreader, so it fits standard server DIMM sockets and clears typical CPU coolers in the SR675 V3, SR850 V3, SR860 V3 and ST650 V3.

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