The problem, it seems, is that if you have the budget for a Mac Pro, you're the sort of person who'd just buy a new one.
The odd thing, though, is that the 8 core Mac Pro I have has held its value well in the sales I've seen because it's still faster than the current 4 core, yet was considered the entry level one at the time..
The odd thing, though, is that the 8 core Mac Pro I have has held its value well in the sales I've seen because it's still faster than the current 4 core, yet was considered the entry level one at the time..