Intel Xeon E5 2403 's Advantages
Lower TDP (80W vs 125W)
Intel Xeon Bronze 3408U 's Advantages
Released 10 years and 8 months late
Higher specification of memory (DDR5-4000 vs DDR3)
Larger L3 cache size (22.5MB vs 10MB)
More modern manufacturing process (10nm vs 32nm)