Intel Xeon X5670 's Advantages
Lower TDP (95W vs 135W)
Intel Xeon E5 2643 v3 's Advantages
Released 4 years and 6 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.4GHz vs 2.933GHz)
Larger L3 cache size (20MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)