PC2100

NOTE! As PC2100 is getting increasingly difficult to acquire, PC3200 can be used instead. Using PC3200 may or may not increase the performance of your model, as some models may underclock it to their respective original DRAM speeds. PC2100 This is DDR SDRAM at 266 MT/s in a 200-pin SO-DIMM form-factor. DDR266 may also be interchangeably referred to as PC2100.

Available DRAM modules from Lenovo

DDR2 type	Individual / Single-Pack Option Marketing Part Number	25-Pack Option Marketing Part Number	Field Replacement Unit (FRU) Service Part Number
Non-ECC, unbuffered 1Rx8 128MB PC2100 CL2.5	10K0028	N/A	10K0029
Non-ECC, unbuffered 1Rx8 256MB PC2100 CL2.5	10K0030	N/A	10K0031
Non-ECC, unbuffered 2Rx8 512MB PC2100 CL2.5	10K0032	N/A	10K0033
Non-ECC, unbuffered 2Rx8 1GB PC2100 CL2.5	10K0034	N/A	10K0035

Models that support this technology

Models	Soldered on motherboard	SO-DIMM Slot 1	SO-DIMM Slot 2	Official Max-Memory	Unofficial Max-Memory
A31, A31p	N/A	Occupied	Depends	1GB	2GB1
T30, T40, T40p	N/A	Occupied	Depends	1GB	2GB1
X31	N/A	Occupied	Depends	1GB	2GB1
R40e	N/A	Occupied	Depends	1GB	1GB2
R32, R40	N/A	Occupied	Depends	1GB	2GB1
G40	N/A	Occupied	Depends	1GB	2GB1

FOOTNOTES [Δ]

1. Attained via two 2Rx8 1GB DDR non-ECC SO-UDIMMs, not possible with 1Rx8 1GB DDR non-ECC SO-UDIMMs. (if they exist)
2. The Radeon IGP 330M graphics+memory controller is incapable of using DRAM modules utilizing 64MB chips, which means it's stuck with 32MB-based DRAM modules. Therefore, only low-density DRAM modules such as a 2Rx8 512MB DDR non-ECC SO-UDIMM will work.

Available DRAM modules from other companies

Manufacturer	Partnumber	Description	Tested on model
TBD	TBD	TBD	TBD