4GB (2GBx2) Team High Performance Memory RAM Upgrade For Toshiba Portege M400-S933 M400-ST4001 M 400-ST4035 M400-ST9113 Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
1GB DDR2 for Toshiba Portege M400 Series PC2-5300 667MHz 200 pin SO-DIMM Laptop Notebook Memory RAM (PARTS QUICK Brand) at Amazon.com
Toshiba Portege M400 - First Take review: Toshiba Portege M400 - First Take - CNET
OFFTEK 1GB Replacement Memory RAM Upgrade for Toshiba Portege M400-ST9113 (DDR2-4200) Laptop Memory at Amazon.com
How to upgrade RAM in Toshiba Portege M400 – Inside my laptop
Toshiba Portege M400 review
Laptop, Toshiba Portege M400, Intel Centrino Processor, 512 MB RAM, No HDD, No Optical Drive, Windows XP Tablet PC Edition Licence Sticker, No Charger, Appears To Function [93027+109]