Intel Xeon W3690 's Advantages
Higher base frequency (3.466GHz vs 2.5GHz)
Lower TDP (130W vs 140W)
Intel Xeon W 2170B 's Advantages
Released 6 years and 10 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (19.25MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)