Intel Xeon X5677 's Advantages
Higher base frequency (3.466GHz vs 2.2GHz)
Intel Xeon E5 2420 v2 's Advantages
Released 3 years and 6 months late
Larger L3 cache size (15MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 130W)