Intel Xeon E5649 's Advantages
Lower TDP (80W vs 350W)
Intel Xeon Platinum 8558P 's Advantages
Released 12 years and 10 months late
Higher specification of memory (DDR5-4800 vs DDR3)
Newer PCIe version (5 vs 2)
Higher base frequency (2.7GHz vs 2.533GHz)
Larger L3 cache size (260MB vs 12MB)
More modern manufacturing process (7nm vs 32nm)