Xeon E7 2803 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (18MB vs 8MB)
Intel Xeon E3 1275 v3 's Advantages
Released 2 years and 2 months late
Higher base frequency (3.5GHz vs 1.733GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (84W vs 105W)