Intel Xeon E5 2689 's Advantages
Released 1 years and 1 months late
Higher specification of memory (DDR3-1600 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 12MB)
Lower TDP (115W vs 130W)
Intel Xeon X5647 's Advantages
Higher base frequency (2.933GHz vs 2.6GHz)