I think the 2450P is just a lower clocked regular 2500 without the integrated GPU. So chances are, you can't overclock it like you can the 2500K.
EDIT: Actually yeah, Wikiepdia says the P series is just without the integrated GPU. ( http://en.wikipedia.org/wiki/List_of_In ... 2832_nm.29
). If you want overclocking potential, K series.
Although I found out I could bump up the multiplier in my computer from 33x to 34x, which has a regular 2500. I haven't confirmed or denied that it actually did anything.