Intel Xeon X5677 's Advantages
Higher base frequency (3.466GHz vs 2.5GHz)
Lower TDP (130W vs 140W)
Intel Xeon W 2175 's Advantages
Released 7 years and 7 months late
Higher specification of memory (2666 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (19.25MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)