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Two green 240-pin DDR3 ECC RDIMM modules in anti-static packaging

OWC

OWC 32GB (2x16GB) DDR3 1333 PC3-10600 CL9 ECC RDIMM memory upgrade

SKU CH-RABZ-HYBMQ

32 GB DDR3 ECC registered DIMM kit (2 × 16 GB) at 1333 MHz CL9 for Lenovo System x3950 X5 servers

  • Capacity32GB (2 x 16GB)
  • Type240-Pin DDR3 ECC RDIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • Voltage1.5V
  • ECCYes

Capacity 32GB (2 x 16GB)

  • ECC registered design protects data integrity in servers
  • 32 GB kit with two 16 GB modules expands capacity
  • DDR3 1333 CL9 speed matches system specifications
  • 5 V operation meets JEDEC standard for efficiency
  • Direct replacement for Lenovo part numbers 03X3813 and 0A89413

System-Specific DDR3 Kit

This 32 GB kit contains two 16 GB DDR3 1333 PC3-10600 CL9 registered ECC modules built for the Lenovo System x3950 X5. It targets administrators who need to expand memory capacity in that specific server platform. The modules operate at 1.5 V and carry the 2Rx4 organisation required by the system. They replace Lenovo part numbers 03X3813 and 0A89413.

Registered ECC Build

Each 240-pin RDIMM uses registered ECC circuitry, a design intended for workstation and server environments rather than standard desktops. The lack of a heat spreader keeps the profile low for dense chassis, while the registered buffer reduces electrical load on the memory controller. Mixing these modules with unbuffered memory is not supported, so the full population must follow the server's population rules.

Pre-Install Checks

Confirm the target machine is a Lenovo System x3950 X5 before ordering, as registered ECC DDR3 will not function in consumer desktop boards. Verify the system's qualified vendor list accepts 16 GB 2Rx4 modules at PC3-10600 speed and that the BIOS revision supports the total capacity you intend to install. Ensure all slots to be populated use identical registered ECC modules.

Highlights

  • ECC registered design protects data integrity in servers
  • 32 GB kit with two 16 GB modules expands capacity
  • DDR3 1333 CL9 speed matches system specifications
  • 5 V operation meets JEDEC standard for efficiency
  • Direct replacement for Lenovo part numbers 03X3813 and 0A89413

Specifications

BrandOWC
Part Number1R3D32R4032P
Capacity32GB (2 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

Does DDR3 1333 PC3-10600 cap the memory bus at 1333 MT/s on the x3950 X5?

Yes, the modules run at DDR3 1333 (PC3-10600) so the data rate is limited to 1333 MT/s on the Lenovo System x3950 X5.

What physical slot and pin count do these 16 GB RDIMMs need?

Each module is a 240-pin DDR3 RDIMM and requires a 240-pin DDR3 DIMM socket on the x3950 X5 motherboard.

How are the two 16 GB sticks installed in the x3950 X5 and what step is often missed?

Install one module per channel in matched pairs, then enable ECC registered mode in BIOS — skipping the BIOS step leaves the memory running unregistered.

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