Intel Xeon E5 2640 's Advantages
Higher base frequency (2.5GHz vs 2.1GHz)
Lower TDP (95W vs 120W)
Intel Xeon w3 2423 's Advantages
Released 10 years and 11 months late
Higher specification of memory (4400 vs 3)
Newer PCIe version (5 vs 3)
More modern manufacturing process (10nm vs 32nm)