Note: PC 133 memory options are supported on the following systems:
- ThinkPad A30 and A30p systems
- ThinkPad R30 and R31 systems
- ThinkPad T23 systems
- ThinkPad X22, X23, X24 and X30 systems
Visit the Memory compatibility document for more information about the amount and speed of memory for each system.
| PC 133 Memory options |
Option part number |
Field replacement unit (FRU) part number |
Customer replaceable unit (CRU) |
Additional information |
| ThinkPad 64MB SDRAM SO DIMM |
19K4650 |
19K4651 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 133 MHz SDRAM memory |
| ThinkPad 128MB SDRAM SO DIMM |
19K4652 |
19K4653 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 133 MHz SDRAM memory |
| ThinkPad 256MB SDRAM SO DIMM |
19K4654 |
19K4655 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 133 MHz SDRAM memory |
| ThinkPad 512MB SDRAM SO DIMM |
19K4656 |
19K4657 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 133 MHz SDRAM memory |
Note: PC 100 memory options are supported on the following systems:
- ThinkPad A20m, A20p, A21e, A21m, A21p, A22e, A22m, and A22p systems
- ThinkPad T20, T21, and T22 systems
- ThinkPad X20, and X21 systems
| PC 100 Memory options |
Option part number |
FRU part number |
CRU |
Additional information |
| ThinkPad 64MB SDRAM SO DIMM |
20L0254 |
20L0264 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 100 MHz SDRAM memory |
| ThinkPad 128MB SDRAM SO DIMM |
20L0255 |
20L0265 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 100 MHz SDRAM memory |
ThinkPad 256MB SDRAM SO DIMM
Note: Not supported on ThinkPad A21e (2628, 2655) and A22e (Intel Celeron) systems. |
33L3069 |
33L3070 |
Yes |
3.3 Volt, 144-pin, non-parity, 64-bit, 100 MHz SDRAM memory |
For instructions on how to remove and install memory, click the appropriate machine:
ThinkPad A2* memory removal
ThinkPad T2* memory removal
ThinkPad X2* memory removal
ThinkPad X30 memory removal
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