Intel Xeon E5 2609 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Lower TDP (80W vs 500W)
Xeon 6980P 's Advantages
Released 12 years and 6 months late
Higher specification of memory (8800 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (504MB vs 10MB)
More modern manufacturing process (5nm vs 32nm)