My brothers PC is slowing down and we basically upgraded everything except CPU, RAM and MOBO. His PC is slowing down even though hes got an SSD which did make it a lot better but It still freezes from time to time while opening Applications like Google chrome. So we're thinking about upgrading him from his I5-4670K to my old I7-4790 non K, but would it be much better? I haven't Overclocked the I5 because IM not really sure how but if I do overclock it would it be better than the stock I7-4790 Locked Ghz? plus I'm not really sure if the motherboard is overclockable.
Here's His rig: https://pcpartpicker.com/list/
Here's His rig: https://pcpartpicker.com/list/