Xeon E6540 's Advantages
Lower TDP (105W vs 118W)
Xeon D 2796TE 's Advantages
Released 11 years and 11 months late
Higher specification of memory (2933 vs 1333)
Newer PCIe version (4 vs 2)
Larger L3 cache size (30MB vs 18MB)
More modern manufacturing process (10nm vs 45nm)