Intel Xeon E5503 's Advantages
Higher base frequency (2GHz vs 1.8GHz)
Lower TDP (80W vs 125W)
Intel Xeon Bronze 3408U 's Advantages
Released 12 years and 10 months late
Higher specification of memory (4000 vs 3)
Newer PCIe version (5 vs 2)
Larger L3 cache size (22.5MB vs 4MB)
More modern manufacturing process (10nm vs 45nm)