Intel Xeon E3 1515M v5 's Advantages
Released 4 years and 11 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (2.8GHz vs 2.533GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 80W)
Intel Xeon E5649 's Advantages
Larger L3 cache size (12MB vs 8MB)