Xeon X3470 's Advantages
Higher base frequency (2.933GHz vs 2.9GHz)
Lower TDP (95W vs 120W)
Intel Xeon W 2102 's Advantages
Released 7 years and 11 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (8.25MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)