Xeon X5570 's Advantages
Higher specification of memory (1333 vs 3)
Lower TDP (95W vs 130W)
Intel Xeon E5 2643 's Advantages
Released 3 years late
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.933GHz)
Larger L3 cache size (10MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)