[simcop2387]

My guess is that the socket side of this is done during development by AMD and then given to the manufacturers directly so that they don't have to do that part. The only other way I could think of is if the tools have a way to lay out as many of the traces in parallel (i.e. tell it, all of these traces are going to the same place just offset a little) and then do most of that automatically for say the RAM and power. I think most of the length and impedance matching is already automate-able in Altium and other high end software.