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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

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Rated voltage1.5 V
  • Buffer typeRegistered
  • Memory rank2Rx4

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.

How it compares

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

Price $82.99
Cheaper than about 70% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $2.59 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number1R3D32R4032P
Total capacity32 GB (2 × 16 GB)
Product type240-Pin DDR3 ECC RDIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo System x3950 X5

Other versions of this model

5 more in the same range

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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