Intel Core i7 6900K 's Advantages
Higher base frequency (3.2GHz vs 1.7GHz)
Larger L3 cache size (20MB vs 12MB)
Intel Core Ultra 7 155UL 's Advantages
Released 7 years and 11 months late
Higher specification of memory (5600 vs 2133)
Larger memory bandwidth (89.6GB/s vs 76.8GB/s)
Newer PCIe version (4 vs 3.0)
More modern manufacturing process (7nm vs 14nm)
Lower TDP (15W vs 140W)