Xeon E6540 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 8MB)
Intel Xeon E3 1280 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 2GHz)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (69W vs 105W)