I'm going to be doing a server upgrade later today. From 2007-era to 2011-era equipment. But, hey, it's only costing me $50 (assuming no surprises that require me to need something else) to double my CPU power and RAM.
Fortunately, I found myself a new place to clone, recently, so that if if things go very wrong, I'll be able to say so.
I've been told that after I swap out the motherboard, my Linux install should still boot right up (both old and new are Intel processors). I'm hoping the fact that I'm using mdadm to mirror my boot drive doesn't complicate matters. If someone knows anything about this, specifically, speak up. I'll be checking back before I begin.