Intel Xeon E3 1280 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon L5638 's Advantages
Larger L3 cache size (12MB vs 8MB)
Lower TDP (60W vs 69W)