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)
Xeon X5570 's Advantages
Higher specification of memory (1333 vs 3)
Lower TDP (95W vs 130W)