I have been practising quite a bit with Carrara/Transposer with Poser 5 and my machine which is a 1.8 Mhz G5, 1.5 Gb Ram and have looked to see how Carrara uses RAM. The answer is that when it can, Carrara will try to use as much as possible and if it doesn't grab enough, textures are dropped from the imported Poser figure. When it does work, it is glorious... as in the case, where I imported the M3 Barbarian into one of the preset Carrara landscapes.