Xeon E7 2803 's Advantages
Lower TDP (105W vs 120W)
Intel Xeon E5 2686 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 1333)
Higher base frequency (2GHz vs 1.733GHz)
Larger L3 cache size (45MB vs 18MB)
More modern manufacturing process (22nm vs 32nm)