Xeon X3440 's Advantages
Higher base frequency (2.533GHz vs 2.2GHz)
Lower TDP (95W vs 205W)
Intel Xeon Gold 5520 's Advantages
Released 14 years and 3 months late
Higher specification of memory (4800 vs 1333)
Newer PCIe version (5 vs 2)
Larger L3 cache size (52.5MB vs 8MB)
More modern manufacturing process (10nm vs 45nm)