Intel Xeon X5660 's Advantages
Higher base frequency (2.8GHz vs 2GHz)
Lower TDP (95W vs 135W)
Intel Xeon E5 2698B v3 's Advantages
Released 4 years and 10 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (40MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)