DB size vs RAM size

[yacenty]

Hello
last days I had switched 2 tables from myisam to the innodb. Accordind to that switch memry used by mysql had jumped.
Just now we are using 3.3gb of memy ram - from possible 4gb
MySQL is using 1gb.
Next days I'm going to switch whole db into innodb - what do You think how much ram should I reserve for mysql if my db is about 1GB disk size?
Should I order 4gb ram memory more? the processor in the server is 2x quad xeon

[Gary.]

Thats alot of usuage for Mysql. Post your current my.cnf config and we take it from there.