Intel Core i9 9900KF 's Advantages
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.6GB/s vs 38.4GB/s)
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (3.6GHz vs 2.0GHz)
Larger L3 cache size (16MB vs 4MB)
Intel Pentium Silver J5040 's Advantages
Released 10 months late
Integrated graphics card
Lower TDP (10W vs 95W)