Intel Xeon X5660 's Advantages
Higher base frequency (2.8GHz vs 1.8GHz)
Larger L3 cache size (12MB vs 6MB)
Intel Xeon E3 1258L v4 's Advantages
Released 5 years and 3 months late
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (47W vs 95W)