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This is DDR (Double Data Rate) memory in 200-pin SO-DIMM form-factor.
PC2700 memory is also called DDR333


Available memory types from IBM or Lenovo

Partnumber FRU Description
31P9828 31P9829 128MB PC2700 DDR-SDRAM CL2.5 SO-DIMM
31P9830 31P9831 256MB PC2700 DDR-SDRAM CL2.5 SO-DIMM
31P9832 31P9833 512MB PC2700 DDR-SDRAM CL2.5 SO-DIMM
31P9834 31P9835 1GB PC2700 DDR-SDRAM CL2.5 SO-DIMM

ThinkPads that support this technology

ThinkPad Models Soldered
on systemboard
Slot 1
Slot 2
G41 Occupied Empty 2GB2 2GB2 3
R50e Occupied Empty 2GB2 2GB2 3
R50, R50p Occupied Empty 2GB2 2GB2 3
R51 Occupied Empty 2GB2 2GB2 3
T41, T41p Occupied Empty 2GB2 2GB2 3
T42, T42p Occupied Empty 2GB2 2GB2 3
X31, X32 Occupied Empty 2GB2 2GB2 3
X40 256 or 512MB Empty NA 1.25 or 1.5GB4 1.25 or 1.5GB3 4

  1. See Unofficial_maximum_memory_specs
  2. Based on 2x 1GB DIMMs, might require removal of original base memory
  3. DDR SO-DIMM modules exist at a maximum of 1GB. You cannot physically install more RAM than the official specs state. Chipset is limited to 2GB.
  4. Based on base 256 or 512MB plus 1GB DIMM in Slot 1