I have one gig on both of my testing machines (PC and MAC), and didn't hit the problem. P6 is a beautiful program, and friendlier than P5. You will want a gig in order to load some of the complex (and truly nifty) props: castles, sailing ships, magical islands are resource intensive, before you even think of adding people! You will be amazed at the difference doubling your ram will make! Carolly