Intel Xeon E5645 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Larger L3 cache size (12MB vs 8MB)
Intel Xeon E3 1578L v5 's Advantages
Released 6 years and 2 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 80W)