Sadly, IMHO, you need a powerful combination of RAM size and processor through-put. Will Poser_12+ still support 32 bit ? Probably, but I fear Pro may be exclusively x64...

Also, having a fair headroom of RAM should help if you need to drive a second display.

I run Win'10 x64 but, despite 32 GB RAM, I've found PoserPro 11.3 x64 may still choke while or after rendering big textures in big scenes in Superfly. Trash collection, Perhaps. Okay, I've learned a few ways to mitigate the log-jam, but eventually have to switch progressive rendering back from my twin GPU cards to the 8-core CPU. And, then, yes, after watching the first few paths' pixels appear, wander off for several leisurely cups of tea...