I'm not familiar with your PC specs nor with your OS and poser versions.

I render 5000x7000 hiquality regurlarly. I tend to use the PoserPro Render in Queue and render at the background, overnight and when I'm out at the office.

Poser cannot split a single image over multiple machines, it handles one image / animation frame per machine. It will be very hard and costly to find render "cows" which meet your own PC spec.

Perhaps my tutorial pages http://www.book.artbeeweb.nl/?p=190 and on might offer some help and background info on this matter.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though