Xeon E7 4830 's Advantages
Larger L3 cache size (24MB vs 18MB)
Xeon E 2456 's Advantages
Released 12 years and 8 months late
Higher specification of memory (4800 vs 1333)
Higher base frequency (3.3GHz vs 2.133GHz)
More modern manufacturing process (10nm vs 32nm)
Lower TDP (80W vs 105W)