http://www.microsoft.com/presspass/press/2007/mar07/03-04512MBMemoryUnitPR.mspx
SAN FRANCISCO — March 4, 2007 — At the Game Developers Conference (GDC) 2007, Microsoft Corp. today announced plans to launch a 512MB Memory Unit for the Xbox 360™ video game and entertainment system and an increase in the official size limit of Xbox LIVE® Arcade games from 50 MB to 150 MB.
The 512MB Memory Unit, available worldwide beginning April 3, 2007, will retail for an estimated retail price of $49.99 (U.S.) in North America.* The 512MB Memory Unit will be pre-loaded with the hit Xbox LIVE Arcade game “Geometry Wars: Retro Evolved†from developer Bizarre Creations Ltd. for a limited time. The original 64MB Memory Unit will simultaneously drop in price from $39.99 to $29.99 (ERP).*