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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

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

{| border="1" cellspacing="0" cellpadding="2"
! ThinkPad !! Official Max !! Unoffical Max !! BIOS !! Embedded Controller !! Memory configuration successfully tested
|- style="vertical-align:top;"
| ThinkPad {{X61t}}<br />7762-94G || 4 GB || 8 GB || 1.23 || 1.02 ||
2 x Kingston 4GB 200-Pin DDR2, KVR667D2S5/4G.
|-
| ThinkPad {{T61p}}<br />8889-3FG || 4 GB || 8 GB || TBA || TBA ||
2 x Kingston 4GB 200-Pin DDR2, KVR667D2S5/4G.
|-
| ThinkPad {{T61p}}<br />6457-5GG || 4 GB || 8 GB || 2.19 || 1.08 ||
2 x Kingston 4GB 200-Pin DDR2, Model# KTL-TP667/4GB.
|-
| ThinkPad {{T61p}}<br />6460-8YG || 4 GB || 8 GB || 2.26 || 1.08 ||
2 x Crucial 4GB 200-Pin DDR2, Model# CT2KIT51264AC667 (2x CT51264AC667)
|-
| ThinkPad {{A31p}}<br />2653-R || 1 GB || || 1.09 || 1.05 ||
2 x Kingston 1GB 200-Pin DDR, Model# KTM - TP9828/1G
|-
| ThinkPad {{T30}}<br />2366-92U || 1 GB || || 2.08 || 1.06 ||
* 2 x Kingmax 1GB 200-Pin DDR SO-DIMM DDR333 PC2700, Model# MSAD42D-KI
but see [[problem with T30 not booting with 1 GiB memory module]].
* 2 x Generic Brand 1GB 200-pin DDR SO-DIMM PC2700 (p/n 89898E):
BIOS recognizes 2048MB, but Gentoo sees only 1024MB
|-
| ThinkPad {{T43p}} 2668-WTB || 2 GB || || 1.29 || 1.06 ||
* 2 x 1GB Kingston KTM TP3840/1G DDR2 533MHz
|-
| ThinkPad {{X31}} 2672-C2G || 1 GB || || 3.02 || 1.08 ||
* 2 x 1GB Kingston KVR400X64SC3A/1G DDR400MHz. Newer documentation also states 2GB, but original one did not.
* Boots with 1 bar.
|-
| ThinkPad {{X31}} 2673-C2G || 1 GB || || 3.02 || 1.08 ||
* 2 x 1GB (Team Group Inc. TSDR1024M400 DDR400MHz)
* Boots with 1 x TSDR1024M400
|-
| ThinkPad {{X41}} 2528-5FU || 1.5 GB || || 2.09 || 1.02 ||
* 1 x 2GB (Transcend TS2GIB3847 DDR2 667 MHz)
* 1 x 2GB (FRU 73P3846 DDR2 PC2-4200)
BIOS claims 2.5 GB. Diagnostic POST tests only 2 GB. Linux and XP recognize 2 GB.
|-
| {{X41_Tablet}} 1866-6HU || 1.5 GB || || 2.03 || 1.02 ||
* 1 x 2GB (Transcend JM667QSU-2G DDR2 667 MHz)
BIOS claims 2.5GB. Diagnostic POST tests only 2GB. Linux and WindowsXP recognize 2GB.
|-
| ThinkPad {{240}}<br />2609-40U || 320MByte || || IRETWWW76 || n/a ||
* Any PC100 256MB memory in 16-chip configuration
|-
| ThinkPad {{240X}}<br /> ||  256MByte || || unknown || n/a ||
* Some PC100 256MB memory in 16-chip configuration may work. Chipset cannot handle more than 256MB
|-
| ThinkPad {{570}}<br />2644-3AU ||  320MB || || 1.16 IMET65WW 11/11/99 || n/a ||
* Kingston KTM-TP390X/256 256MB MODULE FRU 16P6327 - 16 chips, 8 each side
|-
| ThinkPad {{600}}<br /> ? || 288MB || || ? || ? ||
* 416MB = 256MB '''low density''' PC100 SODIMM + 128MB PC66 SODIMM + 32MB PC66 on-board. It matters which SODIMM you put in which slot.  This was first reported working on the [http://zurich.csail.mit.edu/hypermail/thinkpad/2004-04/0797.html Thinkpad Mailing List], and it worked error-free for me.
The 600E (2645-8A0) with Bios INET36WW accept two modules 
of 256MB.
The ram modules have 8 chips on each side.
That results in 544MB. (RAM Typ: Micron MT16LSDF3264HG-133E4 PC133 CL3 sync).
Processor is an Intel PII 366 PE, installed platform is Windows XP Pro with SP3.
|-
| ThinkPad {{770}}x<br />9549|| 448MB || || 1.11 IIET42WW 09/10/99 || n/a ||
* 448MB = 256MB PC100 + 128MB PC66 + internal 64MB using IBM 256MB MODULE FRU 33L3070 PC100 CL2 - 16 chips, 8 each side
* 512MB = 2 x 256MB PC100 + 64MB internal booted up as well. 512MB is due to 440LX-Chipset limitations, 64MB are overlapping or unused.
|-
|}

==Non-working memory configurations==
{| border="1" cellspacing="0" cellpadding="2"
! ThinkPad !! max. Specs !! BIOS !! Embedded Controller !! Memory configuration unsuccessfully tested
|- style="vertical-align:top;"
| ThinkPad {{A21m}}<br /> || 512MB || ? || ? ||
* 2 x Microx 144-pin 512MB PC133 SDRAM SODIMM 32x16 8C
* 1 x Microx 144-pin 512MB PC133 SDRAM SODIMM 32x16 8C
* 1 x Microx 144-pin 512MB PC133 SDRAM SODIMM 32x16 8C
:+ 1 x 144-pin 256MB PC133 SDRAM SODIMM
|-
|}

==External Sources==
* [http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-55644 IBM's official Memory compatibility page]