I have 2500K as my main computer from now, but I'm not completely satisfied with the speed of multitasking. I am trying to see the differences among these two CPU as I am using the same settings in the software. 2500K boots very fast and unpacks a single item really fast, but when it comes to heavy multitasking loser with 1090T sometimes up to a point that I think stagnation. For a fast CPU is powerful 4core though. 1090T is not too slow or too fast, while the 2500K can be. 2500K performance is sometimes worse than the 1090T, and every now and then faster. The 1090T is more impartial. However energy consumption of the wall is a difference.