if its a store prebuilt I wouldnt touch it with a 10 foot poll. If its custom made I would go ahead and do a memory, cpu, and board switch. What kind of system do you got first of all? And yes for an experienced person its really simple. I can switch out a motherboard and be up and running in 15 minutes. For a new person who has never done it probly an hour if they get it all put back together right.