Taken largely from my post in another thread, I hope you find it informative:

I rendered this in P7 w/ Separate Render Process on and 2 threads with FINAL quality settings:

http://www.renderosity.com/mod/gallery/index.php?image_id=1347644

That is V4 w/ High Res Texture Maps, Summer Fashion for V4, Amarseda Hair, Spa of Juturna, with 4 lights, 2 w/ 2048 Shadow Maps, all rendered at 4000x3000 resolution.  Poser 6 laughed at me shortly before dying when I tried to have it render that out as a comparison.

Similarly, I don't think you could call 5 V3's low poly:

http://www.renderosity.com/mod/gallery/index.php?image_id=1186515

That was rendered in P6 and the best I could get it to do was ~2000x1900 with texture size set somewhere around 1536 and texture filtering turned off.  In Poser 7 on Monday Night, I was able to render that out at ~4000x3000 on Final Quality settings w/ Quality Texture filtering set on every texture.  It also rendered at about 3/4 the time that the original smaller P6 render took.

In my experience, it has been nothing but lower memory usage and faster render times, even when using extremely high resolution textures and high poly models.  I even rendered out my Max character w/ Scorpio Rising, which is notorious for being rough on systems, and P7 handled it far more gracefully than P6 ever did.

¤~Giolon~¤

¤~ RadiantCG ~¤~ My Renderosity Gallery ~¤