Intel Xeon E5 2640 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (1866 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 18MB)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (90W vs 130W)
Xeon X7542 's Advantages
Higher base frequency (2.666GHz vs 2.6GHz)