Dell XPS 8900 cpu upgrade to a i7-5930

I have a XPS 8900 with the Intel i7-6700.  Additionally, there is an orphan Intel i7-5930k in my spares.  I'd like to marry the two. While the i7-6700 is more than enough cpu for my needs; I'm one of those guys who like to customize OEM computers just for the experience. I'm almost certain the cpu is a plug in but the bios has me worried.  Any ideas? Suggestions(other than don't do it) would be welcome.