So is the only real difference between a Server setup vs. a Desktop...?

...that a server computer is designed to handle the load moreso than the typical desktop is?

does that mean that as long as i set up a Desktop computer with enough RAM and a decent RAID array, it's about the same?
Update: that's cool guys. it's just that i've noticed that many cheap servers with multiple CPUs have pretty low-end CPUs, so i figured if, by comparison, i had a desktop with a really AWESOME CPU (which is STILL cheaper than a server), that by price comparison, the desktop would do just as good?
Update 2: thanks Ace, but that only describes the difference in SOFTWARE. i'm talking HARDWARE here.
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