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Four green DDR3L ECC registered RDIMM sticks, 240-pin, no heat spreader

OWC

OWC 64GB (4x16GB) DDR3L 1600 CL11 ECC Registered RDIMM 2Rx4 1.35V memory upgrade

SKU CH-SAJ7-YJMFZ

64GB DDR3L 1600 ECC registered RDIMM kit for Lenovo System x3300 M4, x3500 M4, x3530 M4, x3550 M4 and x3630 M4 servers

  • Capacity64GB (4 x 16GB)
  • Type240-Pin DDR3L ECC RDIMM
  • SpeedDDR3L 1600 (PC3L 12800)
  • CAS LatencyCL11
  • Voltage1.35V
  • ECCYes

Capacity 64GB (4 x 16GB)

  • 64 GB capacity across four 16 GB modules for large server workloads
  • DDR3L 1600 CL11 at 1.35 V for low-power registered performance
  • ECC registered RDIMM with 2Rx4 organisation protects data integrity in Lenovo systems
  • 240-pin DDR3L form factor fits x3300 M4, x3500 M4, x3530 M4, x3550 M4 and x3630 M4
  • Replaces Lenovo part numbers 0C19535, 46W0671 and 46W0672 for direct upgrade

Server Memory Upgrade Kit

This 64GB kit contains four 16GB DDR3L 1600 CL11 registered ECC RDIMMs built for Lenovo System x3300 M4, x3500 M4, x3530 M4, x3550 M4 and x3630 M4 servers. Each module runs at 1.35V with a 2Rx4 organisation and fits the 240-pin DDR3 slots in those platforms. The modules are new and intended for workstation or server workloads that require error-correcting registered memory.

Replaces Lenovo Parts

The kit replaces Lenovo part numbers 0C19535, 46W0671 and 46W0672, letting administrators refresh or expand memory without sourcing discontinued OEM modules. The upgrade is worth it when the existing configuration uses smaller RDIMMs or when empty slots are available and the workload benefits from additional capacity. It cannot be mixed with unbuffered DIMMs and will not work in standard desktop computers.

Capacity And Headroom

Four 16GB modules provide 64GB total, giving headroom for virtualisation hosts, database buffers or large in-memory datasets on the supported Lenovo systems. The registered design helps signal integrity at this density, while ECC protects data integrity under sustained load. Systems limited to lower maximum memory per socket or fewer DIMM slots will not be able to use the full kit.

Highlights

  • 64 GB capacity across four 16 GB modules for large server workloads
  • DDR3L 1600 CL11 at 1.35 V for low-power registered performance
  • ECC registered RDIMM with 2Rx4 organisation protects data integrity in Lenovo systems
  • 240-pin DDR3L form factor fits x3300 M4, x3500 M4, x3530 M4, x3550 M4 and x3630 M4
  • Replaces Lenovo part numbers 0C19535, 46W0671 and 46W0672 for direct upgrade

Specifications

BrandOWC
Part Number1R6T32R4064S
Capacity64GB (4 x 16GB)
Type240-Pin DDR3L ECC RDIMM
SpeedDDR3L 1600 (PC3L 12800)
CAS LatencyCL11
Voltage1.35V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo System x3300 M4
Lenovo System x3500 M4
Lenovo System x3530 M4
Lenovo System x3550 M4
Lenovo System x3630 M4

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Questions about this item

Will these 240-pin DDR3L RDIMMs fit the DIMM slots in a Lenovo System x3550 M4?

Yes — the kit is validated for the x3550 M4 and every module is a 240-pin DDR3L 1600 registered DIMM that matches the server's slot keying.

What is the correct installation sequence for the four 16 GB modules in an x3630 M4?

Populate the slots in the order shown in the server's service guide — typically one module per channel first, then the second rank — and do not mix these registered DIMMs with any unbuffered memory.

Which Lenovo part numbers does this 64 GB kit replace when a module fails?

The kit replaces Lenovo part numbers 0C19535, 46W0671 and 46W0672, so a failed 16 GB DIMM can be swapped with any module from this set.

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