Someone correct me if I'm wrong, but the extra RAM usage won't really speed up render times, since they are limited by CPU.

I just tested a single dragon figure in PP2012 and in P8 at 1600x1236 resolution, draft quality render settings (with IDL and 1 RT bounce).

On PP2012: 1:39; on P8: 1:49

I tried another smaller image featuring transmapped hair, a clothed Vicky, and SSS.  The SSS calculation only used 1 core and took up a significant portion of time. 

PP2012: 4.37 (of which ~2:30 minutes was SSS calculation).

P8: 4:19. Of course, without the SSS and GC, in P8, the same image look like utter garbage. 

PP2012: 1:48 without SSS.  So much, much faster.

The gain that you get with being able to use more than 3GB of RAM is that if you have a scene that requires a lot of RAM, Poser won't just quit in the middle of a render when it reaches that 3GB limit.  That used to happen to me all the time with P8, and has yet to happen with PP2012.  I would never go back to P8.  It annoyed me too much.

But don't be disappointed if a mere upgrade in software does not suddenly make all renders lighting fast. A bit faster with some scenes, a lot faster with others, maybe a bit slower with some (if you use SSS).

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.