Quote - EDIT: I'm using a i7-990x@4Ghz. this guy has 6 cores / 12 threads instead of your 4 / 8 so the gain would be 12/8 * 4,0/3,2 = almost twice as fast. And I never had a Poser scene eating 6Gb ram by itself.

If you use large scenes you get very easily over 6GB. With a render dimension of 3000x2000 I get well over 20GB. Irradiance caching uses a whole lot of memory. Also PP2012 uses up to 25% of physical memory for its cache. So increasing memory definitely will improve performance of larger scenes

 - I use a i7 990X with 24GB of memory. Next machine will have more memory