Intel Xeon E5 2649 v3 's Advantages
Higher specification of memory (2133 vs 1866)
Larger L3 cache size (25MB vs 6MB)
Intel Xeon E3 1283L v4 's Advantages
Released 9 months late
Higher base frequency (2.9GHz vs 2.3GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (47W vs 105W)