Intel Xeon E5 2689 's Advantages
Released 2 years late
Higher specification of memory (DDR3-1600 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 12MB)
Intel Xeon X5667 's Advantages
Higher base frequency (3.066GHz vs 2.6GHz)
Lower TDP (95W vs 115W)