I have two old processors laying around - a i5 2500k and an i5 3570k. I know the 3570k is the newer and *slightly* faster chip, but would I be better off dropping in the 2500k and overclocking it? Also, and this maybe the wrong forum to ask, but when using Plex for a 4k UHD video playback, the video buffers often and it maxes out all the cores on the 2500. I'm not using a transcoder like HandBrake, but should I be? Thanks for the tips.