Intel Xeon E3 1220 's Advantages
Higher base frequency (3.1GHz vs 2GHz)
Lower TDP (80W vs 500W)
Xeon 6980P 's Advantages
Released 13 years and 5 months late
Higher specification of memory (8800 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (504MB vs 8MB)
More modern manufacturing process (5nm vs 32nm)