Carrara 7.1 is now LAA (LargeAddressAware) and can make use of more than 2GB of memory.

Here's a sample scene using multiple models which could choke other programs:

http://forum.daz3d.com/viewtopic.php?p=1705778#1705778

There is also a script available somewhere that allows you to export Poser dynamic cloth animations as a sequence of morphs in a Poser pz3 file which Carrara can natively import and handle without having to use TransPoser and you get to then use the Carrara shader tree without problems from the Poser connection which you can run into with TransPoser. I've read about it but haven't used it yet. I think it's available as a download in a DAZ Studio tutorial. I think it allows the use of Poser 7 that way, too, if you don't use layers in animation, as you are just exporting morphs and poses and nothing newer technology wise, or at least that's how I read it .

Kevin