With a PGA, the mfr can make a per-board or per-production-run
decision on whether to socket it.

Typically, the early runs are socketed, and later ones are soldered,
but other factors are present like the chance of having to scrap
the board or upgrade the CPU.  Even the number of sockets and chips
in inventory or the lead time on socket or chip orders can tip the
decision.  So it's likely that not all system boards in system X
are made the same way.

Also, some of the nicer EV6 boxes use a cpu daughtercard arrangement,
so you need an entire assembly with support chips to add a second
cpu.

> > > The DS10 has the CPU soldered in.
> > 
> > No it does not. I just checked my own DS10 and that one has it
> > socketed. Not a ZIF socket (with a handle) but a ordinary one.

ISTR someone pointing out that simple PGA sockets are difficult to
deal with. I certainly agree: an expensive tool (which is difficult
to use) may be required just to get it out of the socket.

	r.o.s.s