Intel Xeon E3 1220 v3 's Advantages
Lower TDP (80W vs 255W)
Intel Xeon W 3175X 's Advantages
Released 5 years and 7 months late
Higher specification of memory (DDR4-2666 vs DDR3-1600)
Larger L3 cache size (38.5MB vs 8MB)
More modern manufacturing process (14nm vs 22nm)