I want to upgrade a 4,1 single processor Mac Pro to dual CPU's. There has to be an easier way. From what I've seen, any reasonably priced 4,1 dual cpu tray is going to need the processors replaced. The whole de-lidded CPU thing is a turn off as there have been far too many posts of upgrades gone wrong. Should I spend an extra $115 and upgrade to a 5,1 logic board to go with a 5,1 $275 dual cpu tray?