Intel Xeon E5649 's Advantages
Higher base frequency (2.533GHz vs 2.3GHz)
Lower TDP (80W vs 145W)
Intel Xeon E5 2696 v3 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (45MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)