Intel Xeon E5649 's Advantages
Lower TDP (80W vs 350W)
Intel Xeon Platinum 8458P 's Advantages
Released 11 years and 11 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 (82.5MB vs 12MB)
More modern manufacturing process (10nm vs 32nm)