Know 4 GB is recommended, but will Parallels at least run slowly on 2 GB?

[DavidStephenson]

I am considering Parallels, but if I add 2 GB memory to my MacBook -- all it can accomodate -- it will still only run an effective 3.2 GB of RAM. I realize that's less than optimal, but would Parallels still run -- if slower -- on 3.2 GB or the 2 GB I have now?