Xeon X5570 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (8MB vs 5MB)
Intel Xeon E5 2637 's Advantages
Released 3 years late
Newer PCIe version (3 vs 2)
Higher base frequency (3GHz vs 2.933GHz)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 95W)