It came with 1 Gig of memory and it has worked well for all but the most extreme jobs. The price for a 2 Gig upgrade came down enough that I couldn't pass it up.
The results? I am plesantly suprised. Before on a large job with a lot of display objects panning and rotating the layout was choppy, with the most extreme jobs it was so bad I had to switch to \"wire frame while moving\", even then it was very slow. Adding the extra Gig of memory made it so that I can now keep it fully rendered and the panning/ rotating is only a little choppy. Renders and rebuilds are faster as well. It seems to be more stable as well. I could generally predict when a crash was going to occur.... like changing the material thickness on an entire job after making a lot of other changes in the same session. It now preforms those functions more reliably and faster.
It was worth it. So if you have a Gig it seems that adding another Gig will help.