Xeon E5530 's Advantages
Higher specification of memory (1066 vs 3)
Lower TDP (80W vs 95W)
Intel Xeon X5667 's Advantages
Released 1 years late
Higher base frequency (3.066GHz vs 2.4GHz)
Larger L3 cache size (12MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)