Intel Xeon E5 1681 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.9GHz vs 2GHz)
Larger L3 cache size (25MB vs 18MB)
More modern manufacturing process (22nm vs 45nm)
Xeon E7540 's Advantages
Lower TDP (105W vs 135W)