(Assuming you meant 64 GigaBytes, not MegaBytes)

     DrifterLee, Poser Pro 2012 can use as much memory as you machine holds. I've managed to nudge past 48 GB when rendering, but I'd say that 16 GB would cover 90% of my renders, and 24 GB would be enough for 99%.

     The amount of memory you'll use depends on your Poser habits. I tend to make massive scenes with complex materials, and render them at large pixel dimensions with resource-heavy render settings.

     Those poser users who tend toward portraiture could probably use an 8 GB machine and never approach its memory limit.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5