I just found this comparison at Techspot that may be useful for those who still haven't bought the game and want to know how it will fare on their hardware:
http://www.techspot.com/review/405-the-witcher-2-performance/
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.