File Size

I'm working with CaATPase, with almost 1000 residues. I need a view with a surface. I have one with a soft solid, colored by parent type of the various domains. The file size is about 330 MB! I want to export as a POV files and render. The trouble is, apparently neither my Mac nor my Windows machine has enough memory to render the file. The Mac is a G5 with 2.5 processors and 1.5 GB of RAM. The WIndows box has even more power than the Mac, yet the file is too big for either computer. Any advice on minimizing file size?

Thanks,

Greg