the one you pick is not ecc but has b1 steppings for timing
http://ark.intel.com/Product.aspx?id=47932
ORDERING AND SPEC INFORMATION
Ordering and Spec Information
Boxed Intel® Core™ i7-980X Processor Extreme Edition (12M Cache, 3.33 GHz, 6.40 GT/s Intel® QPI) FC-LGA10
Socket Step Step TDP Ordering Code Spec Code Halogen Free VT-x
FCLGA1366 B1 130 Watts BX80613I7980X SLBUZ Yes Yes
Intel® Core™ i7-980X Processor Extreme Edition (12M Cache, 3.33 GHz, 6.40 GT/s Intel® QPI) FC-LGA10, Tray
Socket Step Step TDP Ordering Code Spec Code Halogen Free VT-x
FCLGA1366 B1 130
below is the w3670 proven and tested by dozens of us price is about the same. supports ecc is just a bit slower maybe 97 or 98 percent the speed of your pick. I have a memory that someone got your pick to work but I am not sure.
http://ark.intel.com/Product.aspx?id=47918
ORDERING AND SPEC INFORMATION
Ordering and Spec Information
Intel® Xeon® Processor W3670 (12M Cache, 3.20 GHz, 4.80 GT/s Intel® QPI) FC-LGA10, Tray
Socket Step Step TDP Ordering Code Spec Code Halogen Free VT-x
FCLGA1366 B1 130 Watts AT80613005490AC SLBVE Yes
As an aside I have been told by 10.7.x users that the 3.2 hex does work without problems. Still if you are a 3.2 hex or a 3.46 hex modder keep copies of 10.6.x just in case of a problem when you switch to 10.7.x