Intel Xeon X5687 's Advantages
Higher base frequency (3.6GHz vs 3GHz)
Intel Xeon E5 1680 v2 's Advantages
Released 2 years and 7 months late
Higher specification of memory (DDR3-1866 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (25MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)