Intel Xeon E5 2689 's Advantages
Released 2 years late
Higher specification of memory (1600 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 12MB)
Lower TDP (115W vs 130W)
Intel Xeon W3680 's Advantages
Higher base frequency (3.333GHz vs 2.6GHz)