Intel Xeon X5680 's Advantages
Larger L3 cache size (12MB vs 8.25MB)
Lower TDP (130W vs 140W)
Intel Xeon W 2135 's Advantages
Released 7 years and 6 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.7GHz vs 3.333GHz)
More modern manufacturing process (14nm vs 32nm)