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

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[[image:so-dimm.jpg|SO-DIMM]]
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=== Available memory types from IBM or Lenovo ===
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! 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 ===
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! ThinkPad Models !! Soldered<br>On Systemboard !! DIMM<br>Slot 1 !! DIMM<br>Slot 2 !! Official<br>Max-Memory !! Unofficial<br>Max-Memory{{Footnote|1}}
|-
| {{R51e}} || || Occupied || Empty || 2GB{{Footnote|2}} || Unknown
|-
| {{R52}} || || Occupied || Empty || 2GB{{Footnote|2}} || 2GB{{Footnote|3}}
|-
| {{T43}}, {{T43p}} || || Occupied || Empty || 2GB{{Footnote|2}} || 2GB{{Footnote|3}}
|-
| {{X41}}, {{X41T}} || 256 or 512MB || Empty || NA || 1.28 or 1.53GB{{Footnote|4}} || 2GB{{Footnote|3}} {{Footnote|5}}
|-
| {{T60p}} || || Occupied || depends || 4GB{{Footnote|6}} || 4GB{{Footnote|6}}
|-
| {{Z60m}}, {{Z60t}} || || Occupied || Empty || 2GB{{Footnote|2}} {{Footnote|3}}|| 2GB{{Footnote|2}} {{Footnote|3}}
|}
{{Footnotes|
# See [[Unofficial maximum memory specs]]
# Based on 2x 1GB DIMMs, might require removal of original base memory
# Due to Intel 915 chipset limitation, addressable memory is 2GB
# Based on base 256 or 512MB plus 1GB DIMM in Slot 1
# Based on base 256 or 512MB plus 2GB DIMM in Slot 1
# Due to Intel 945 chipset limitation, addressable memory will be (4GB - I/O space) ~ 3.1GB}}
[[Category:Components]]