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ThinkStation S20/D20 PC3-8500 1066MHz and PC3-10600 1333MHz DDR3 ECC UDIMM Memory - Overview

ThinkStation Workstation 1GB (41U5251) / 2GB (41U5252) PC3-8500 1066MHz DDR3 ECC SDRAM

Features and specifications

The ThinkStation S20/D20 PC3-8500 1066MHz and PC3-10600 1333MHz DDR3 ECC UDIMM memory offerings let you upgrade standard system memory capacity to improve overall system performance. Features and benefits include:

  • Test-proven 100% compatibility on listed ThinkStation systems
  • Meets stringent ThinkStation reliability standards for memory products
  • Lenovo Limited Warranty
  • Authenticity seal on every memory module


  • 1GB PC3-8500 1066MHz DDR3 ECC UDIMM Memory (51J0503)
  • 2GB PC3-8500 1066MHz DDR3 ECC UDIMM Memory (51J0504)
  • 1GB PC3-10600 1333MHz DDR3 ECC UDIMM Memory (43R2032)
  • 2GB PC3-10600 1333MHz DDR3 ECC UDIMM Memory (43R2033)
  • 4GB PC3-10600 1333MHz DDR3 ECC UDIMM Memory (57Y4138)

Performance specifications:

  • DDR3 memory offers higher bandwidth and increased performance at low power
  • DDR3 offers data transfer rates up to 1600 Mbps
  • Lower power consumption of 1.5 volts instead of of 1.8 volts by DDR2 memory
  • Error Correcting Code (ECC) for greater data integrity and system uptime by protecting against errors in memory
  • DDR3 provides an 8-bit prefetch buffer, compared to the 4-bit buffer for DDR2, storing more data before it is needed
  • Integrated thermal sensor on the DIMM module signals the chip set to throttle memory traffic to the DIMM if its temperature exceeds a programmable critical trip point
  • 240-pin JEDEC/EIA standard UDIMM interface
  • Gold-plated leads

Physical specifications:

  • Approximate height: 8 mm (0.3 in)
  • Approximate width : 134 mm (5.3 in)
  • Approximate depth : 30 mm (1.2 in)
  • Approximate weight: 0.1 kg (0.2 lb)

Operating environment:

  • Temperature: 0 deg to 55 deg C (32 deg to 131 deg F)
  • Relative humidity: 10% to 90%


3 year - Customer Replacement Unit (CRU) Service

2GB PC3-8500 (51J0504), 2GB PC3-10600 (43R2033):

  • Announce Date: March 2009 (Worldwide)
  • Availability Date: April 2009 (Worldwide)

1GB PC3-8500 (51J0503), 1GB PC3-10600 (43R2032):

  • Announce Date: March 2009 (Worldwide)
  • Availability Date: April 2009 (Worldwide)
  • Discontinued, no longer available: August 2010

4GB PC3-10600 (57Y4138):

  • Announce Date: August 2009 (Worldwide)
  • Availability Date: August 2009 (Worldwide)

Hardware compatibility
Machine Type - Models
ThinkStation D20
ThinkStation S20


  • ThinkStation D20 has 12 memory slots; divided into two sets of 6-DIMM memory slots.
  • ThinkStation S20 has 6 slots.
  • ThinkStation S20 and D20:
    • Mixing memory speeds; 1066 with 1333; causes system to operate at the lowest installed speed.
    • When using four or more 1333 are installed, ThinkStation operates at DDR3-1066 memory speed.
    • Memory speed operation is dependent on processor speed.
      • For optimal performance, memory speed should match processor memory bus speed.
  • ThinkStation D20:
    • Mixing of UDIMM and RDIMM is not supported.
    • When using sever or more modules, ThinkStation D20 requires a second processor.

  • Memory module: 1 GB or 2 GB or 4 GB
  • Publication

Additional product information
Service parts - Part number listing for your product
Lenovo Support: Workstation Accessories - Reference Guide list - A list of other ThinkStation workstation accessories.
Personal Systems Reference (PSREF) - Comprehensive information on the features and technical specifications of Lenovo products.

If you are unable to find what you are looking for, please do try the following options:
1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

Document ID : PD002510
Legacy Document ID : MIGR-72637
Last Updated :
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