Xeon E 2278G 's Advantages
Released 7 years and 2 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Higher base frequency (3.4GHz vs 3GHz)
Larger L3 cache size (16MB vs 5MB)
More modern manufacturing process (14nm vs 32nm)
Intel Xeon E5 2637 's Advantages
Lower TDP (80W vs 95W)