Intel Xeon E5 4640 's Advantages
Larger L3 cache size (20MB vs 12MB)
Lower TDP (95W vs 105W)
Intel Xeon Silver 4309Y 's Advantages
Released 8 years and 11 months late
Higher specification of memory (DDR4-2667 vs DDR3)
Newer PCIe version (4 vs 3)
Higher base frequency (2.8GHz vs 2.4GHz)
More modern manufacturing process (10nm vs 32nm)