Xeon L5639 's Advantages
Larger L3 cache size (12MB vs 8MB)
Lower TDP (60W vs 71W)
Xeon E 2234 's Advantages
Released 8 years and 3 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 2.133GHz)
More modern manufacturing process (14nm vs 32nm)