Intel Xeon E5 2643 's Advantages
Lower TDP (130W vs 175W)
Xeon w3 2525 's Advantages
Released 12 years and 5 months late
Higher specification of memory (4400 vs 3)
Newer PCIe version (5 vs 3)
Higher base frequency (3.5GHz vs 3.3GHz)
Larger L3 cache size (22.5MB vs 10MB)
More modern manufacturing process (10nm vs 32nm)