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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 DO-DIMM modules exist at a maximum of 1 GB. You cannot physically install more RAM than the official specs state. Chipset is limited to 2 GB.
  4. Based on base 256 or 512MB plus 1GB DIMM in Slot 1