Intel Xeon W 2155 's Advantages
Released 7 years and 5 months late
Higher specification of memory (2666 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.8GHz)
Larger L3 cache size (13.75MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)
Intel Xeon X5660 's Advantages
Lower TDP (95W vs 140W)