PC-100
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>=== PC-100 === This is 100MHz SDRAM memory in 144-pin SO-DIMM form-factor. </div> |
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Available memory types from IBM
| 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
| ThinkPad Models | Soldered on systemboard |
DIMM Slot 1 |
DIMM Slot 2 |
Official Max-Memory |
Unofficial Max-Memory1 |
|---|---|---|---|---|---|
| 240X | 64MB | Empty | NA | 192MB5 | 256MB |
| 390X | Occupied | Empty | 512MB2 | Unknown | |
| 570E | 64MB | Empty | NA | 320MB6 | Unknown |
| 600X | 64MB | Occupied | Empty | 576MB3 | Unknown |
| 770X | 64MB | Occupied | Empty | Unknown | 448MB7 or 512MB2 |
| A20m, A20p | Occupied | Empty | 512MB2 | Unknown | |
| A21e | Occupied | Empty | 256MB4 | Unknown | |
| A21m, A21p | Occupied | Empty | 512MB2 | Unknown8 | |
| A22e - Celeron | Occupied | Empty | 256MB4 | <384MB | |
| A22e - Pentium III | Occupied | Empty | 512MB2 | Unknown | |
| A22m, A22p | Occupied | Empty | 512MB2 | Unknown | |
| S30, S31 | 128MB | Empty | NA | 256MB5 | Unknown |
| T20, T21, T22 | Occupied | Empty | 512MB2 | Unknown | |
| TransNote | 64MB | Empty | NA | 320MB6 | Unknown |
| X20 | 64MB | Empty or 64MB DIMM |
NA | 320MB6 | Unknown |
| X21 | 64 or 128MB | Empty | NA | 320MB or 384MB6 | Unknown |
| i Series 1200 | 32 or 64MB | Empty | NA | 160 or 192MB5 | PC133/256MB6 |
| i Series 1210 | 32MB | Empty | NA | 160MB5 | Unknown |
| i Series 1230, i Series 1250, i Series 1260 |
64MB | Empty | NA | 192MB5 | Unknown |
| i Series 1300, i Series 1330, i Series 1370 |
64MB | Empty | NA | 192MB5 | Unknown |
| i Series 1422, i Series 1442, i Series 1482, i Series 1483, i Series 1492 |
Occupied | Empty | 256MB4 | Unknown | |
| i Series 1542, i Series 1562, i Series 1592 |
Occupied | Empty | 256MB4 | Unknown |
| FOOTNOTES [Δ] |
- 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 Mac-How
- 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.
