1) RAM is being replaced now. Will know the result soon I hope.
2) In discussion on 3.x, I realize there isn't any way to migrate. I have 20 sites on my machine, half use databases. There are about 40 users, only 15 are actively used. It would only be a matter of configuring the sites databases and users in the new ISPCONFIG and then copying the data over.
I don't know much about SQL so that would be my only problem there. It'd require dumping databases and restoring them to new names that are created by the 3.x installation.