Intel Xeon E5 2403 's Advantages
Larger L3 cache size (10MB vs 8.25MB)
Lower TDP (80W vs 120W)
Intel Xeon W 2104 's Advantages
Released 5 years and 3 months late
Higher specification of memory (2666 vs 3)
Higher base frequency (3.2GHz vs 1.8GHz)
More modern manufacturing process (14nm vs 32nm)