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This is DDR2 (Double Data Rate) memory in 200-pin SO-DIMM form-factor.
PC2-4200 memory is also called DDR2-533


Available memory types from IBM or Lenovo

Partnumber FRU Description
73P3840 73P3841 256MB PC2-4200 DDR2 NP CL4 SO-DIMM
73P3842 73P3843 512MB PC2-4200 DDR2 NP CL4 SO-DIMM
73P3844 73P3845 1GB PC2-4200 DDR2 NP CL4 SO-DIMM
73P3846 73P3847 2GB PC2-4200 DDR2 NP CL4 SO-DIMM

ThinkPads that support this technology

ThinkPad Models Soldered
On Systemboard
Slot 1
Slot 2
R51e Occupied Empty 2GB2 Unknown
R52 Occupied Empty 2GB2 2GB3
T43, T43p Occupied Empty 2GB2 2GB3
X41, X41 Tablet 256 or 512MB Empty NA 1.28 or 1.53GB4 2GB3 5
T60p Occupied depends 4GB6 4GB6
Z60m, Z60t Occupied Empty 2GB2 3 2GB2 3

  1. See Unofficial maximum memory specs
  2. Based on 2x 1GB DIMMs, might require removal of original base memory
  3. Due to Intel 915 chipset limitation, addressable memory is 2GB
  4. Based on base 256 or 512MB plus 1GB DIMM in Slot 1
  5. Based on base 256 or 512MB plus 2GB DIMM in Slot 1
  6. Due to Intel 945 chipset limitation, addressable memory will be (4GB - I/O space) ~ 3.1GB