Intel Xeon E3 1225 's Advantages
Higher base frequency (3.1GHz vs 2GHz)
Lower TDP (95W vs 205W)
Intel Xeon Gold 5420 's Advantages
Released 11 years and 9 months late
Higher specification of memory (4400 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (52.5MB vs 6MB)
More modern manufacturing process (10nm vs 32nm)