#A4000/A3000 Help
What processor board? A3000s don't come stock with processor boards. If
you put a 3640 in it, sure, you could use that in an A4000. I'm not sure
about which third-party boards that work in an A3000 work in an A4000, but
I'd think all of them would — the CPU slots are supposed to be the same.
No one is selling 4000Ts. There aren't any to sell (there are only about
150 in the world).