Intel Xeon E5606 's Advantages
Lower TDP (80W vs 140W)
Intel Xeon W 2135 's Advantages
Released 6 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 2.133GHz)
Larger L3 cache size (8.25MB vs 8MB)
More modern manufacturing process (14nm vs 32nm)