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ThinkCentre 256MB and 512MB PC2-6400 DDR2-800 SDRAM UDIMM Memory - Overview


Features and specifications

The ThinkCentre 256MB or 512MB PC2-6400 DDR2-800 SDRAM UDIMM Memory offers:

  • Memory capacities:
    • 256MB (41U2975)
    • 512MB (41U2976)
  • Maximum data transfer rate of up to 6,400 MBps
  • 240-pin UDIMM with gold-plated leads
  • Serial presence detect and decode functions


  1. PC2-5300 and PC2-6400 memory can coexist on one system, but will operate at PC2-5300 speed.
  2. Data transfer rate may vary based upon many factors and is often less than the maximum possible.

Performance specifications
  • PC2-6400 DDR2 SDRAM memory upgrades -- The 6400 is a figure derived from twice the memory-side bus clock frequency (400 MHz x 2; data transfers can occur on both edges of the clock) times the module data width (64 bits / 8 bits/byte = 8 bytes) = 6,400. This is the maximum data rate; the units are MBps.
  • Column Address Strobe (CAS) Latency (CL) of 6 (memory bus clock cycles) for PC2-6400 memory.
  • Non-parity mode organized as 32M x 64, 64M x 64 and 128M x 64 respectively.
  • Serial presence detect with Serial EEPROM.
  • 240-pin JEDEC/EIA standard UDIMM interface.
  • Gold-plated leads.

Physical specifications
  • Individual/Single Pack Unpackaged Memory (memory module only):
    • Approximate height: 4 mm (0.2 in)
    • Approximate width: 133 mm (5.3 in
    • Approximate depth: 30 mm (1.2 in)
    • Approximate weight: 0.1kg (0.2 lb)
  • Individual/Single Pack Packaged Memory (memory module and carton)
    • Approximate height: 28 mm (0.2 in)
    • Approximate width: 180 mm (5.3 in
    • Approximate depth: 65 mm (2.6 in)
    • Approximate weight: 0.15 kg (0.3 lb)

3 year Customer Replacement Unit (CRU) Service

  • Announce date: 26 September 2006 (Worldwide)
  • Planned availability date: 29 September 2006 (Worldwide)
  • Discontinued, withdrawn from marketing:
    • 256GB (41U2975): July 2008
    • 512MB (41U2976): July 2008

Hardware compatibility

The 256MB and 512MB PC2-6400 NP DDR2 SDRAM UDIMM memory upgrades are supported on the following machine types:

  • ThinkCentre M55 (type 8793, 8794, 8797, 8798, 8800, 8801, 8802, 8805, 8810, 8811, 8814, 8816)
  • ThinkCentre M55p (type 8792, 8794, 8796, 8798, 8800, 8802, 8804, 8806, 8808, 8811)

Note: Some configurations may not be compatible.

  • 256MB or 512MB PC2-6400 NP DDR2 SDRAM UDIMM memory
  • Publication

Additional product information
Service parts - Part number listing for your product
Lenovo Support: Memory - Reference Guide - Information on memory for notebooks, desktops, and workstations
Lenovo Support: Memory Compatibility - Desktops - Compatibility information for multiple desktop systems
Personal Systems Reference (PSREF) - Comprehensive information on the features and technical specifications of Lenovo products.

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1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

Documento de identidad : PD003856
Legacy Document ID : MIGR-65986
Última actualización :
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