Intel Xeon E5 2620 's Advantages
Released 2 years late
Newer PCIe version (3 vs 2)
Larger L3 cache size (15MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 130W)
Intel Xeon W3530 's Advantages
Higher base frequency (2.8GHz vs 2GHz)