Intel Core i7 6900K 's Advantages
Released 2 years and 6 months late
Higher specification of memory (DDR4-2133 vs DDR3L-1333)
Larger memory bandwidth (76.8GB/s vs 21.3GB/s)
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (3.2GHz vs 2.0GHz)
More modern manufacturing process (14nm vs 22nm)
Intel Celeron J1900 's Advantages
Integrated graphics card
Lower TDP (10W vs 140W)