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Four green DDR3 ECC registered DIMMs with gold contacts

OWC

OWC 64GB DDR3 1333 PC3-10600 CL9 2Rx4 240-pin 1.5V ECC Registered RDIMM Memory Upgrade Kit

SKU CH-WX66-FZB86

Four 16 GB DDR3 ECC registered DIMMs at 1333 MHz for Lenovo System x3950 X5

  • Capacity64GB (4 x 16GB)
  • Type240-Pin DDR3 ECC RDIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • Voltage1.5V
  • ECCYes

Capacity 64GB (4 x 16GB)

  • ECC registered design protects data integrity in server workloads
  • 64 GB kit (4 × 16 GB) expands Lenovo System x3950 X5 capacity
  • DDR3 1333 PC3-10600 CL9 matches original system specifications
  • 5 V 240-pin RDIMM form factor installs directly in compatible slots
  • Replaces Lenovo part numbers 03X3813 and 0A89413 for validated compatibility

Server-grade ECC memory kit

This 64 GB kit contains four 16 GB DDR3 1333 modules built to PC3-10600 CL9 timings at 1.5 V. Each stick is a 240-pin registered ECC RDIMM with 2Rx4 organisation. The set is validated for the Lenovo System x3950 X5 and replaces Lenovo part numbers 03X3813 and 0A89413.

Passive thermals and power profile

No heat spreader is fitted so airflow from the server chassis handles cooling directly across the DRAM. Registered buffering reduces electrical load on the memory controller, helping keep power draw predictable in multi-DIMM configurations. Operation stays within standard DDR3 1.5 V limits.

Build integration and constraints

Four populated slots are required so the target platform must expose at least that many 240-pin DDR3 sockets. The modules are incompatible with unbuffered desktop boards and cannot be mixed with non-ECC memory. Buyers needing consumer DDR3 or higher-density single modules should look elsewhere.

Highlights

  • ECC registered design protects data integrity in server workloads
  • 64 GB kit (4 × 16 GB) expands Lenovo System x3950 X5 capacity
  • DDR3 1333 PC3-10600 CL9 matches original system specifications
  • 5 V 240-pin RDIMM form factor installs directly in compatible slots
  • Replaces Lenovo part numbers 03X3813 and 0A89413 for validated compatibility

Specifications

BrandOWC
Part Number1R3D32R4064S
Capacity64GB (4 x 16GB)
Type240-Pin DDR3 ECC RDIMM
SpeedDDR3 1333 (PC3 10600)
CAS LatencyCL9
Voltage1.5V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo System x3950 X5

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Questions about this item

How do I install the four 16 GB DDR3 1333 RDIMMs in a Lenovo System x3950 X5, and what step is often missed?

Power down the server, open the chassis, and seat each 240-pin module firmly until the ejector clips click; the step often missed is populating all four slots in the matched-channel order shown in the x3950 X5 service guide so the 64 GB kit runs at the rated PC3-10600 speed.

What maintenance or replacement will the OWC 64 GB DDR3 ECC Registered kit need over its service life?

The modules have no heat spreaders and no moving parts, so no routine maintenance is required; replacement is only necessary if a DIMM fails, at which point OWC's Advanced Replacement programme supplies a new 16 GB RDIMM of the same PC3-10600 CL9 specification.

What limit appears first when the x3950 X5 runs sustained workloads with this 64 GB DDR3 1333 CL9 kit?

The memory bus tops out at 1333 MT/s and CL9 latency, so bandwidth and latency ceilings are reached before the 1.5 V registered DIMMs hit any thermal or power limit.

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