Intel Core i7 6900K 's Advantages
Larger memory bandwidth (76.8GB/s vs 38.4GB/s)
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (3.2GHz vs 2.0GHz)
Intel Celeron J4125 's Advantages
Released 3 years and 6 months late
Integrated graphics card
Higher specification of memory (2400 vs 2133)
Lower TDP (10W vs 140W)