To reply to Bambam131 above:  I have rendered a gig plus size image before. And that was about 5-6 years ago when I had a AMD Athlon 1100 Mhz proc and about a gig of ram.  It took forever and a day to render it.  It would show that bryce wasn't responding, but eventually would catch up after a couple nights of sleep!  I would say o add your extra engine or ship and push it above a gig, maybe even 2 gigs. I don't know what kind and size puter you got, but with todays puters I would feel it would definately handle those complex images we all know you make at it!!  Good Luck!!