Intel Xeon E5649 's Advantages
Larger L3 cache size (12MB vs 8MB)
Intel Xeon E3 1220 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (DDR3-1600 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2.533GHz)
More modern manufacturing process (22nm vs 32nm)