You're right I found out. Our real problem with the older databases is the restriction on the number of waypoints in the database. No way around it other than a new FMS.
Thanks for your feedback folks and for those that are interested I came this recent 2012 IEEE document that presented the subject nicely
FLIGHT MANAGEMENT COMPUTER (FMC) NAVIGATION DATABASE CAPACITY
http://www.mitre.org/work/tech_paper...24/12_1324.pdf