Intel Xeon E5 2665 's Advantages
Larger L3 cache size (20MB vs 8MB)
Intel Xeon E3 1220 v5 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (3GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (80W vs 115W)