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Memory options - ThinkPad A31, A31p, G40, G41, R32, R40, R40e, R50, R50e, R50p, R51, T30, T40, T40p, T41, T41p, T42, T42p, X31, X40

The memory options listed here are for the following ThinkPad systems. (Each system name contains a link to instructions for installing and removing the memory.)

Visit the Memory compatibility document for more information about the amount and speed of memory for each system.

PC2700 Memory optionsOption P/NFRU P/NCRU

Notes:

  • PC2700 memory options are supported by the following ThinkPad systems:
    • G41, R50, R50e, R50p, R51, T40, T40p, T41, T41p, T42, T42p, and X40
    • Systems that support PC2100 memory
  • The ThinkPad R50e and T40 systems will run PC2700 memory at 266MHz
  • All PC2700 memory is 333MHz Double Data Rate (DDR) Synchronous DRAM (SDRAM), front side bus clock frequency 400MHz, non-parity, 200-pin SODIMM, with gold-plated leads
  • If the memory modules are mixed (for example, using both PC 2100 and PC 2700) or the system supports only PC2100 memory, then the system memory will run at 266MHz.
ThinkPad 128MB CL2.5 DDR SDRAM SO DIMM 31P9828 31P9829 Yes
ThinkPad 256MB CL2.5 DDR SDRAM SO DIMM 31P9830 31P9831 Yes
ThinkPad 512MB CL2.5 DDR SDRAM SO DIMM 31P9832 31P9833 Yes
ThinkPad 1GB CL2.5 DDR SDRAM SO DIMM
Note: Only supported with the following ThinkPad systems:
  • G41
  • R50, R50e, R50p, R51
  • T40, T40p, T41, T41p, T42, T42p
  • X40
31P9834 31P9835 Yes

PC2100 Memory optionsOption part number (P/N)Field replaceable unit (FRU) P/NCustomer replaceable unit (CRU)

Notes:

  • PC2100 memory options are no longer available. Please substitute the corresponding PC2700 memory option parts.
  • PC2100 memory options are suppoted by the following ThinkPad systems:
    • A31, A31p, G40, R32, R40, R40e, T30, T40, T40p, X31
  • PC2100 memory options are not supported by the following ThinkPad systems:
    • R50e, R51, and X40
  • All PC2100 memory is 266MHz Double Data Rate (DDR) Synchronous DRAM (SDRAM), front side bus clock frequency 133MHz x 2, non-parity, 200-pin SODIMM, with gold-plated leads
ThinkPad 128MB CL2.5 DDR SDRAM SO DIMM 10K0028 10K0029 Yes
ThinkPad 256MB CL2.5 DDR SDRAM SO DIMM 10K0030 10K0031 Yes
ThinkPad 512MB CL2.5 DDR SDRAM SO DIMM 10K0032 10K0033 Yes
ThinkPad 1GB CL2.5 DDR SDRAM SO DIMM
Note:
Only supported with the following ThinkPad systems:
  • R40, R40e
  • T40
10K0034 10K0035 Yes
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