PC-100

2008-11-11T19:35:19Z

Kludge: /* ThinkPads that support this technology */

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=== PC-100 ===
This is 100MHz SDRAM memory in 144-pin SO-DIMM form-factor.

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[[image:so-dimm.jpg|SO-DIMM]]
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=== Available memory types from IBM ===
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! Partnumber !! FRU !! Description
|-
| 20L0253 || 20L0263 || 32MB PC100 SDRAM NP SO-DIMM
|-
| 20L0254 || 20L0264 || 64MB PC100 SDRAM NP SO-DIMM
|-
| 20L0255 || 20L0265 || 128MB PC100 SDRAM NP SO-DIMM
|-
| 33L3069 || 33L3070 || 256MB PC100 SDRAM NP SO-DIMM
|}
{{NOTE|As PC-100 memory is getting increasingly difficult to aquire, [[PC-133]] memory may be substituted on some models. Using PC-133 memory will not increase system performance, as it will be run at only PC-100 speed. PC133 memory cannot be used on T20, T21, or T22 models.}}

=== ThinkPads that support this technology ===
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! ThinkPad Models !! Soldered on systemboard !! DIMM Slot 1 !! DIMM Slot 2 !! Official Max-Memory !! Unofficial Max-Memory{{Footnote|1}}
|-
| {{240X}} || 64MB || Empty || NA || 192MB{{Footnote|5}} || 256MB
|-
| {{390X}} || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown
|-
| {{570E}} || 64MB || Empty || NA || 320MB{{Footnote|6}} || Unknown
|-
| {{600X}} || 64MB || Occupied || Empty || 576MB{{Footnote|3}} || Unknown
|-
| {{770X}} || 64MB || Occupied || Empty || Unknown || 448MB{{Footnote|7}} or 512MB{{Footnote|2}}
|-
| {{A20m}}, {{A20p}} || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown
|-
| {{A21e}} || || Occupied || Empty || 256MB{{Footnote|4}} || Unknown
|-
| {{A21m}}, {{A21p}} || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown{{Footnote|8}}
|-
| {{A22e}} - Celeron || || Occupied || Empty || 256MB{{Footnote|4}} || <384MB
|-
| {{A22e}} - Pentium III || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown
|-
| {{A22m}}, {{A22p}} || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown
|-
| {{S30}}, {{S31}} || 128MB || Empty || NA || 256MB{{Footnote|5}} || Unknown
|-
| {{T20}}, {{T21}}, {{T22}} || || Occupied || Empty || 512MB{{Footnote|2}} || Unknown
|-
| {{TransNote}} || 64MB || Empty || NA || 320MB{{Footnote|6}} || Unknown
|-
| {{X20}} || 64MB || Empty or 64MB DIMM|| NA || 320MB{{Footnote|6}} || Unknown
|-
| {{X21}} || 64 or 128MB|| Empty|| NA || 320MB or 384MB{{Footnote|6}} || Unknown
|-
| {{i1200}} || 32 or 64MB|| Empty|| NA || 160 or 192MB{{Footnote|5}} || PC133/256MB{{Footnote|6}}
|-
| {{i1210}} || 32MB|| Empty|| NA || 160MB{{Footnote|5}} || Unknown
|-
| {{i1230}}, {{i1250}}, {{i1260}} || 64MB|| Empty|| NA || 192MB{{Footnote|5}} || Unknown
|-
| {{i1300}}, {{i1330}}, {{i1370}} || 64MB|| Empty|| NA || 192MB{{Footnote|5}} || Unknown
|-
| {{i1422}}, {{i1442}}, {{i1482}}, {{i1483}}, {{i1492}} || || Occupied|| Empty || 256MB{{Footnote|4}} || Unknown
|-
| {{i1542}}, {{i1562}}, {{i1592}} || || Occupied|| Empty || 256MB{{Footnote|4}} || Unknown
|}
{{Footnotes|
# See [[Unofficial_maximum_memory_specs]]
# Based on 2x 256MB DIMMs, might require removal of original base memory
# Based on base 64MB plus 2x 256MB DIMM in Slots 1 and 2
# Based on 2x 128MB DIMMs, might require removal of original base memory
# Based on base memory plus 128MB DIMM in Slot 1
# Based on base memory plus 256MB DIMM in Slot 1
# Based on base 64MB plus 1x 256MB and 1x 128MB DIMMs in Slots 1 and 2
# Intel 440BX motherboard accepts up to 128 Mbit (''not '''Mbyte''''') chips on the SODIMM, i.e.: 16MX8, 32MX4, etc. A 256MB SODIMM '''must''' have 16 visible chips to be compatible. 512MB per slot, for a total of 1GB, is theoreticaly possible; "stacked" SODIMMS with 32 128Mb chips exist, but they're rare, expensive, and may not fit in the RAM slots with the cover closed.}}
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