Bruno's right, it depends on a lot of factors. I run Vue 9 Infinite with 8 Gig RAM and use Poser a lot in my images, but it still chokes if I try to do too much. You have 4 more so it should be better than mine.

My next pc will have 16 in, soon hopefully..

Injustice will be avenged.
Cofiwch Dryweryn.