Intel Xeon E5503 's Advantages
Lower TDP (80W vs 135W)
Intel Xeon E5 2698B v3 's Advantages
Released 4 years and 10 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (40MB vs 4MB)
More modern manufacturing process (22nm vs 45nm)