Intel Xeon E3 1280 v5 's Advantages
Higher base frequency (3.7GHz vs 1.9GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (80W vs 105W)
Intel Xeon E5 4640 v3 's Advantages
Higher specification of memory (1866 vs 4)
Larger L3 cache size (30MB vs 8MB)