Already did. These are the only Mac's that have a Sandy Bridge Core:
Mac-942B5BF58194151B / iMac12,1
Mac-942B59F58194171B / iMac12,2
Mac-8ED6AF5B48C039E1 / Macmini5,1
Mac-4BC72D62AD45599E / Macmini5,2
Mac-7BA5B2794B2CDB12 / Macmini5,3
Mac-94245B3640C91C81 / MacBookPro8,1...