[jitter] loading more than 2GB of matrixes?

Hi,

I am trying to load a bunch of video clips into jit.qt.movie objects,  
more than 2GB worth.  When I simply create enough jit.qt.movie  
objects (about 200 of them, at 320x240, inside a poly~) and cross  
this threshold of 2GB, max immediately crashes, or pauses for awhile  
unresponsively and then crashes.  The same happens when I try to  
allocate jit.matrix objects of a total size that is greater than 2GB  
- say, a single [jit.matrix 4 char 320 240 2000] or 7 of [jit.matrix  
160 120 1000].  (Each [jit.matrix 320 240 1] is about 300K)

My question is, how come there is this limit when creating matrices  
but not when loading a gigantic jit.qt.movie-read file into ram?   
That way, I can load 5GB of movie data (into 16GB or RAM, for some  
reason...).  If OS X is 64-bit, ow come Max is limited to 32 bits of  
address space?  I'm probably missing something here.

Best
Evan