Xeon X5570 's Advantages
Lower TDP (95W vs 140W)
Intel Xeon W 2135 's Advantages
Released 8 years and 5 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.7GHz vs 2.933GHz)
Larger L3 cache size (8.25MB vs 8MB)
More modern manufacturing process (14nm vs 45nm)