Intel Core i7 6900K 's Advantages
Larger memory bandwidth (76.8GB/s vs 34.1GB/s)
Larger L3 cache size (20MB vs 8MB)
Intel Core i7 6785R 's Advantages
Integrated graphics card
Higher specification of memory (2133 vs 2133)
Newer PCIe version (3 vs 3.0)
Higher base frequency (3.3GHz vs 3.2GHz)
Lower TDP (65W vs 140W)