Intel Xeon E5 1620 's Advantages
Higher base frequency (3.6GHz vs 2GHz)
Lower TDP (130W vs 160W)
Xeon 6543P B 's Advantages
Released 12 years and 11 months late
Higher specification of memory (5600 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (128MB vs 10MB)
More modern manufacturing process (5nm vs 32nm)