Xeon E7 2803 's Advantages
Lower TDP (105W vs 250W)
Xeon w7 2575X 's Advantages
Released 13 years and 4 months late
Higher specification of memory (4800 vs 1333)
Higher base frequency (3GHz vs 1.733GHz)
Larger L3 cache size (45MB vs 18MB)
More modern manufacturing process (10nm vs 32nm)