There are server and consumer versions of most of the Nehalem family CPUs using both socket 1156 and 1366. There are actually more server versions, including low voltage versions, than consumer versions.
Lynnfield/1156 Xeon X3460 & i7 860
Bloomfield/1366 Xeon W3530 & i7 930
Gulftown (32 nm)/1366 Xeon X5680 & i7 980X 6 core
Right now the i7 980X 6core is the only consumer Gultown released even though there are 16 server versions http://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors