Intel Core i7 8700K 's Advantages
Better graphics card performance
Higher base frequency (3.7GHz vs 3.4GHz)
Larger L3 cache size (12MB vs 2MB)
Intel Celeron G5900 's Advantages
Released 2 years and 7 months late
Larger memory bandwidth (42.7GB/s vs 41.6GB/s)
Lower TDP (58W vs 95W)