Spotlight today is on the PowerEdge 2850. Worked on one today, after finishing up a couple of 2800s, and they're very similar machines. In fact they take the same motherboard, and the machine knows what chassis its in based on the riser, I believe. The difference between then is that the 2800 is a tower or a 5U rack unit, and the 2850 is a 2U rack unit, so it takes much less space. On the other hand, it doesn't have as much room for hard drives and such. So bottom line here, if you want the 2800's capabilities but don't need the hard drive or expansion slots, the 2850 is a good choice.