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