Intel Xeon E5 2689 's Advantages
Higher specification of memory (DDR3-1600 vs DDR3)
Higher base frequency (2.6GHz vs 2GHz)
Intel Xeon E7 8880L v3 's Advantages
Released 3 years and 3 months late
Larger L3 cache size (45MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)