Intel Xeon E5 2640 's Advantages
Released 2 years late
Newer PCIe version (3 vs 2)
Higher base frequency (2.5GHz vs 1.866GHz)
Larger L3 cache size (15MB vs 12MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (95W vs 105W)
Xeon E7530 's Advantages
Higher specification of memory (1333 vs 3)