Xeon W 1390 's Advantages
Released 9 years and 2 months late
Higher specification of memory (DDR4-3200 vs DDR3)
Newer PCIe version (4 vs 3)
Higher base frequency (2.8GHz vs 1.8GHz)
More modern manufacturing process (14nm vs 32nm)
Intel Xeon E5 2648L 's Advantages
Larger L3 cache size (20MB vs 16MB)
Lower TDP (70W vs 80W)