Intel Xeon E3 1220 v3 's Advantages
Released 2 years and 2 months late
Higher specification of memory (DDR3-1600 vs DDR3)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 95W)
Intel Xeon E3 1245 's Advantages
Higher base frequency (3.3GHz vs 3.1GHz)