Intel Xeon W3530 's Advantages
Higher base frequency (2.8GHz vs 2GHz)
Intel Xeon E5 4603 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (10MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 130W)