I see; so they are slightly different then?
Xeons use ECC memory, whereas desktop variants like the i3/i5/17 can't (consumer models). Certain Xeons also allow SMP (in other words, multiple physical CPUs) and the consumer variants are single-CPU only. Xeons undergo more rigorous reliability testing as well, since they're intended for workstaiton and server markets, where downtime is unacceptable.
But other than those differences, Xeons should be virtually identical in performance to their consumer equivalents. Anymore, they all share the same underpinnings.