That's weird....this is what I came up with on the s/n
That's what I thought it was ( 8 core, not 12 ) as I couldn't find any info on the 2010 "12 core". But I did think that all of the 2010 5,1 ran the 1333 memory as as opposed to 1066. Btw, the SMC version & processor tray is 1.39F11