It looks like it's a similar design externally, but it might have changed internally. For example, there are two thunderbolt ports now. They also don't sell the

It looks like it's a similar design externally, but it might have changed internally. For example, there are two thunderbolt ports now. They also don't sell the "server" configuration anymore, which had also had 5400rpm drives. So, it still could be from heat. It's probably a cost issue, but there is a lot at play in such a small system.