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Two green DDR3 ECC RDIMM modules with gold contacts

OWC

OWC 16GB (2x8GB) DDR3 1333 ECC Registered RDIMM memory upgrade Lenovo ThinkStation C20x D20

SKU CH-9DQC-SM43C

16 GB DDR3 1333 ECC registered RDIMM kit for Lenovo ThinkStation C20x and D20 workstations

  • Capacity16GB (2 x 8GB)
  • Type240-Pin DDR3 ECC RDIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • Voltage1.5V
  • ECCYes

Capacity 16GB (2 x 8GB)

  • ECC registered design protects data integrity on workstations and servers
  • 16 GB kit (2 x 8 GB) expands memory capacity for demanding tasks
  • DDR3 1333 CL9 modules match Lenovo ThinkStation C20x and D20 specifications
  • 5 V registered RDIMM ensures stable operation in compatible systems
  • Replaces Lenovo part numbers including 0A89412 and 46C0542

What this product is and who it is for

OWC 16GB DDR3 ECC Registered RDIMM kit contains two 8GB modules rated at 1333 MT/s with CL9 timing. It is built for Lenovo ThinkStation C20x and D20 workstations that require registered memory with error correction. Standard desktop boards cannot use this memory.

How it behaves under sustained load

Registered buffering reduces electrical load on the memory controller, helping stability during long compute sessions. ECC detects and corrects single-bit errors, protecting data integrity in server-grade workloads. Modules run at 1.5V without a heat spreader, relying on chassis airflow.

The specification that decides fit

This kit only works in systems that accept 240-pin DDR3 ECC Registered RDIMMs. Mixing with unbuffered DIMMs will prevent boot. Verify the ThinkStation model is C20x or D20 before ordering.

Points forts

  • ECC registered design protects data integrity on workstations and servers
  • 16 GB kit (2 x 8 GB) expands memory capacity for demanding tasks
  • DDR3 1333 CL9 modules match Lenovo ThinkStation C20x and D20 specifications
  • 5 V registered RDIMM ensures stable operation in compatible systems
  • Replaces Lenovo part numbers including 0A89412 and 46C0542

Caractéristiques

BrandOWC
Part Number1R3D32R4016P
Capacity16GB (2 x 8GB)
Type240-Pin DDR3 ECC RDIMM
SpeedDDR3 1333 (PC3 10600)
CAS LatencyCL9
Voltage1.5V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkStation C20x
Lenovo ThinkStation D20

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Questions sur cet article

How much power does the 1.5V DDR3 1333 RDIMM kit draw when the workstation runs continuously?

Each module operates at 1.5 volts, the standard DDR3 voltage, so total power scales with the 16 GB capacity and CL9 timing rather than exceeding typical registered DIMM limits.

Does my Lenovo ThinkStation C20x or D20 need a specific BIOS revision or matching DIMM ranks to accept this 2Rx4 registered kit?

The kit replaces Lenovo part numbers 0A89412, 46C0542, 46C7449, 46U3419, 49Y1436, 49Y1446, 57Y4427, 67Y0017 and 67Y1464, so the supported systems recognise the 2Rx4 registered modules without extra configuration.

Can I keep my existing unbuffered DDR3 sticks and add this ECC registered pair for more capacity?

No — the manufacturer highlights state that registered memory cannot be mixed with unbuffered memory, so all installed DIMMs must be ECC registered for the system to function.

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