Intel Xeon E5 2640 's Advantages
Higher base frequency (2.5GHz vs 2GHz)
Intel Xeon E5 2628L v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (DDR4-1866 vs DDR3)
Larger L3 cache size (25MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (75W vs 95W)