what is the difference between i7 7th generation and 8th generation?
The desktop i7–8700 and above have 6 cores, where as the i7–7700 and 7700k (7th gen) has 4 cores. The mobile i7 (8th gen) have 4 cores, where as the i7–7500 and above only have 2 cores, resulting in higher multi-core peformance for the 8th gen processors. (60% faster for mobile, 20–40% faster for desktop).