Xeon E5530 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Lower TDP (80W vs 250W)
Xeon 6746E 's Advantages
Released 15 years and 3 months late
Higher specification of memory (5600 vs 1066)
Newer PCIe version (5 vs 2)
Larger L3 cache size (96MB vs 8MB)
More modern manufacturing process (5nm vs 45nm)