Rikki, the more memory the better. In fact, Garritan prefers you not use direct from disk streaming and load all of the instruments into RAM. If you only have 512mb of RAM then loading fewer instruments may be necessary. It should work. In my case I do use direct from disk streaming and I have no problem loading 8 instruments into kontakt some of which are JABB. As you know my computer has 2GB of RAM and things work well & fast.