If you have a Mac Pro, the answer is right now. I have 2 GB of memory in my Mac Pro and have been able to run Parallels just fine for the past couple weeks (since the initial Mac Pro compatible build came out). I installed the new build today and Parallels gave me a bogus alert that it needed to limit my RAM to 2 GB (recall, I only have 2 GB installed) I clicked OK to Parallel's bogus error message and restarted, and I see that Parallels limited my machine's RAM to 1.95 GB I guess my question is "why did Parallels do this" since my machine only has 2 GB of RAM anyway and was running fine? It also seems there's no way to revert...if I do so, Parallels will simply refuse to run. This is a bit frustrating, since my 2 GB of RAM is supposed to be supported and Parallels has disabled some 50 MB of my RAM for no good reason.
. One kilobyte would, on the surface of it, be expected to be one thousand bytes. But it is one thousand and twenty-four bytes. So 1.95 billion bytes multiplied by 1.024 equals two billion bytes. You see, they are just making the math more correct. Now, you may feel that this is a bit of a silly answer. And some may feel that it is a bit silly to worry about 50 out of 2000. There have been inconsistancies in performance using the full 2Gb, so hence the small limitation. .
RAM limiting I've got 1.5GB in my iMac and still get the message - it seems a bit bizarre - it insists on limiting the RAM and rebooting before Parallels will run.