Intel Xeon E5 2669 v3 's Advantages
Larger L3 cache size (30MB vs 8MB)
Intel Xeon E3 1280 v5 's Advantages
Released 9 months late
Higher specification of memory (DDR4 vs DDR3)
Higher base frequency (3.7GHz vs 2.3GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (80W vs 120W)