Xeon EC3529 's Advantages
Lower TDP (65W vs 140W)
Intel Xeon W 2155 's Advantages
Released 7 years and 6 months late
Higher specification of memory (2666 vs 1066)
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.133GHz)
Larger L3 cache size (13.75MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)