''Some features may not support when installed on 8 series chipsets.''
like ecc memory is not supported on desktop but is on server and that's something not of great importance
''ECC Memory Supported indicates processor support for Error-Correcting Code memory. ECC memory is a type of system memory that can detect and correct common kinds of internal data corruption. Note that ECC memory support requires both processor and chipset support.''
the zeon supports more but the desktop chipsets don't support what the server boards will - no big deal
also xeon don't have ipg so you need a vid card or onboard graphics [like server boards have ]
http://ark.intel.com/compare/75055,80807,80811,75054,75123,75047
most part is xeon chips are overclockable like -K- chips all you got to look at on the boards your interested in is there cpu support list to see if the xeons are supported on that board
example [my board has support for 24 xeons chips ]
http://www.asrock.com/mb/Intel/Z87%20Extreme6/?cat=CPU