Intel Xeon X5650 's Advantages
Lower TDP (95W vs 140W)
Intel Xeon W 2155 's Advantages
Released 7 years and 5 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.666GHz)
Larger L3 cache size (13.75MB vs 12MB)
More modern manufacturing process (14nm vs 32nm)