vPro on a Dell Optiplex 990 - Not in there? i3 vs. i5 vs. i7

when building a dell optiplex 990, it gives you these choices:

 No Out-of-Band Systems Management [subtract $15.00]
   Intel® Standard Manageability [Included in Price]
   Intel® vPro Technology Enabled [add $15.00]
but I choose vpro and it complains my i3 processor isn't vpro compatible?
you have to go up to i5?  What else do you get when you move up to the i5 or i7?
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