quad core processing

I am working with NX3 on a computer with an intel xeon quad core processor and 8gigs of ram. This is a 32bit application running on 64bit windowsXP. While generating extremely large drawings I max out at 25% cpu use and 4 gigs of ram as I would expect. I am really just wondering if there are 64 bit versions of NX3/4/5. And if there are, are they able to break up the processing for something like generating a single view. Oddly enough I am able to generate the views I want on the old and somewhat outdated single core peocessors of the UNIX boxes if I let think for a day or so.

[cbtracker]

Don't know if this will help but I thought it may be applicable when you said you max out at 25% CPU

UGS: Unigraphics (UG/NX) - Dual core processor usage with NX?