Intel Xeon E3 1225 v5 's Advantages
Released 2 years and 1 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (80W vs 130W)
Intel Xeon E5 2637 v2 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (3.5GHz vs 3.3GHz)
Larger L3 cache size (10MB vs 8MB)