Intel Xeon E5 2643 v2 's Advantages
Released 2 years and 7 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 2.133GHz)
Larger L3 cache size (15MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5606 's Advantages
Lower TDP (80W vs 130W)