The 4070 is a good card, just be sure you don't only upgrade from Poser 2014 Pro to Poser 11 - since I seem to recall that 11 can't 'see' the 40-series cards. But I assume you'll be going for the latest Poser 13.x. You may, however also want Poser 11 on your PC alongside a newer version - since 11 is needed for compatibility with the newly free E-on Vue.

The other problem you'll have is your old Python scripts and utilities, re: the change from using Python 2 to Python 3 - this page of links will help you out with that: https://jurn.link/dazposer/index.php/p12/

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Learn the Secrets of Poser 11 and Line-art Filters.