I am about to buy this new CPU but I am not sure if take the KF version or the basic one. I will use it for CAD, 3D and some Gaming at 1080p. I am not planning to overclock it so actually I wonder if that K is worth that 40 € more. What do you think?
Only you know exactly how you value the extra performance. Another factor you might wish to consider is the power draw, though -- the KF version is nearly double the wattage of the basic 10600. Over a few years, that cost will be even more than the price differential of the cpus themselves.