Intel Xeon X5677 's Advantages
Higher base frequency (3.466GHz vs 2.6GHz)
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)