Intel Xeon E5 2678 v3 's Advantages
Released 2 years and 10 months late
Larger L3 cache size (30MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2689 's Advantages
Higher specification of memory (DDR3-1600 vs DDR3)
Higher base frequency (2.6GHz vs 2.5GHz)
Lower TDP (115W vs 120W)