Quote - If Poser 7 is only 32bit application then it won't use 4GB of ram. 32bit windows can allocate only 2GB of ram for an application (without "dirty" hacks). That includes virtual and real memory.
Here's some info about 32 vs 64 bit and memory http://en.wikipedia.org/wiki/64-bit#Memory_limitations

That's why I hoped that Poser 7 would also have 64bit version, even more than multithreading support. I'd rather have slow renderer, than faster that whines "Out of memory" like current one. But maybe that new memory management will fix that.

Luckily dual/quad core doesn't have anything to do with 32/64bit. It's the same as multiprocessor computer from 10-15 years ago when most operating systems were 32bit, or even 16bit. So they work properly in 32bit environment, only thing that's required is that operating system supports it, and Windows XP (and 2000, and other based on NT core) do.

I could be wrong but isn't it 2 gig max per thread? that would mean that you could use 8 gigs for the four threads. (Again its been a while since i read the specs so.... )

Also Poser does not need to be 64 bit. (Its been discussed before.) What would benefit from 64-bit support is the renderer, the hair/cloth rooms, and anything else that does large number crunching. If you want to know if the raytracer can handle 64 bit check out the company that codes it for e-f. If their current version is 64 bit you might get lucky.