Intel Core i7 6800K 's Advantages
Larger memory bandwidth (76.8GB/s vs 35.76GB/s)
Larger L3 cache size (15MB vs 8MB)
Intel Core i7 7700K 's Advantages
Released 8 months late
Integrated graphics card
Higher specification of memory (2400 vs 2133)
Higher base frequency (4.2GHz vs 3.4GHz)
Lower TDP (91W vs 140W)