Windows 7 64 bit
Core Quad Q9300
only 4 GB RAM
Geforce 8800 GT

Vue 8 complete, resolution 6000x4500,  render runs OK (veery slowly, but it works). However, when I hit render button, Vue8.eon process took 1,4 GB of memory, now after 2% it is on 3,1GB and still grows, so it is possible that it will crash in a few minutes (or hours).

As far as I know, in 32 bit system any process can use max 2 GB of RAM, so if you switch to 64 bit, I´m sure it helps. Amount of RAM is not main problem IMHO.