Intel Xeon X5660 's Advantages
Higher base frequency (2.8GHz vs 2.0GHz)
Lower TDP (95W vs 300W)
Intel Xeon Platinum 8558U 's Advantages
Released 13 years and 9 months late
Higher specification of memory (4800 vs 3)
Newer PCIe version (5 vs 2)
Larger L3 cache size (260MB vs 12MB)
More modern manufacturing process (7nm vs 32nm)