Intel Xeon E3 1283L v4 's Advantages
Released 3 years and 3 months late
Higher specification of memory (DDR3-1866 vs DDR3)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (47W vs 130W)
Intel Xeon E5 2643 's Advantages
Higher base frequency (3.3GHz vs 2.9GHz)
Larger L3 cache size (10MB vs 6MB)