Intel Xeon E5606 's Advantages
Lower TDP (80W vs 165W)
Intel Xeon E7 8891 v3 's Advantages
Released 4 years and 4 months late
Higher specification of memory (DDR3 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (2.8GHz vs 2.133GHz)
Larger L3 cache size (45MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)