Xeon L5639 's Advantages
Higher specification of memory (1333 vs 3)
Lower TDP (60W vs 130W)
Intel Xeon E5 4650 's Advantages
Released 1 years and 3 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.7GHz vs 2.133GHz)
Larger L3 cache size (20MB vs 12MB)