Intel Xeon E5645 's Advantages
Larger L3 cache size (12MB vs 8MB)
Intel Xeon E3 1275 v5 's Advantages
Released 5 years and 7 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)