I have only 1.5 Gb of system RAM, but I get the out of memory error frequently. Or did, until I went back to P5. It's the system RAM plus the swap file, so if you have 2 Gb system RAM, you're definitely over 2Gb when you add in your swap file.

I did try lowering my swap file to get me under 2 Gb, but it didn't work. Though it did lower the amount of damage done. Maybe I needed to lower it even more.