Unofficial maximum memory specs

Some ThinkPads are known to support more memory than their specs say. This page gathers information about those models, how much memory they can take and what special requirements that memory must fulfill.

Have a look at the Memory page for the official memory configs and partnumbers

Tested Memory configurations

The following table gives an overview of tested memory configurations that exceed the specified limits for that ThinkPad type.

ThinkPad	max. Specs	BIOS	Embedded Controller	Memory configuration successfully tested
ThinkPad T30 2366-92U	1 GB	2.08	1.06	Kingmax 1GB 200-Pin DDR SO-DIMM DDR333 (PC2700) Model # MSAD42D-KI Kingmax 1GB 200-Pin DDR SO-DIMM DDR333 (PC2700) Model # MSAD42D-KI but see problem with T30 not booting with 1 GiB memory module.
ThinkPad 240 2609-40U	320MByte	IRETWWW76	n/a	Any PC100/256MByte memory in 16 Chip Configuration will do
ThinkPad 570 2644-3AU	320MByte	1.16 IMET65WW 11/11/99	n/a	Kingston KTM-TP390X/256 256MB MODULE FRU 16P6327 - 16 Chips 8 each side
ThinkPad 600  ?	288 mb	?	?	416 mb = 256 mb low density PC-100 SODIMM + 128 mb PC-66 SODIMM + 32 mb PC-66 onboard (Note: that which SODIMM you put in which slot matters. This was first reported working on the Thinkpad Mailing List, and it worked error-free for me when I tested it.
ThinkPad A31p 2653-R	1 GB	1.09	1.05	Kingston 1GB 200-Pin DDR Model # KTM - TP9828/1G Kingston 1GB 200-Pin DDR Model # KTM - TP9828/1G

External Sources

• IBM's official Memory compatibility page