Intel Xeon E3 1275 's Advantages
Higher base frequency (3.4GHz vs 3.2GHz)
Lower TDP (95W vs 165W)
Intel Xeon Gold 5515 's Advantages
Released 12 years and 8 months late
Higher specification of memory (4800 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (22.5MB vs 8MB)
More modern manufacturing process (10nm vs 32nm)