Xeon L5639 's Advantages
Larger L3 cache size (12MB vs 8.25MB)
Lower TDP (60W vs 120W)
Intel Xeon W 2104 's Advantages
Released 6 years and 6 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2.133GHz)
More modern manufacturing process (14nm vs 32nm)