Question about Intel Core i7-8700

So basically, a fan is included, but it's not too good. i.e. when it's warm, the cpu might clock down so that it doesn't get too warm. in summer, it will definitely be quite loud. that's why I recommend buying an aftermarket cooler, such as the Arctic Freezer 13 (13cm).

The supplied fan has 3 strips of thermal paste on it. So with the boxed fan, you don't need any additional thermal paste.
However, I have my i7-8700 with the be quiet! Dark Rock 3 in operation and mounted with Thermal Grizzly Kryonaut (12.5W/m K) thermal paste -> better cooling performance.

it has one (according to the answer to the 1st question about this product "the supplied fan has 3 strips of heat conducting pase on it").