Intel Xeon E5 2630 's Advantages
Lower TDP (95W vs 135W)
Intel Xeon E5 1691 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Higher base frequency (2.5GHz vs 2.3GHz)
Larger L3 cache size (35MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)