Intel Xeon E3 1245 v2 's Advantages
Higher base frequency (3.4GHz vs 1.9GHz)
Lower TDP (77W vs 105W)
Intel Xeon E5 4640 v3 's Advantages
Released 3 years and 1 months late
Higher specification of memory (DDR4-1866 vs DDR3)
Larger L3 cache size (30MB vs 8MB)