Then put it on front, also should have checked before buying.i bought a 280mm but doesnt fit on top of case
Big = good...
the 8700k is not a very hot running chip, at max taking around 130watts.
A 120mm is enough, but i'd be comfortable with a 240mm or 280mm.
My 8700k is under a 360mm H150i from corsair and it's as chilly as ice.
Then put it on front, also should have checked before buying.i bought a 280mm but doesnt fit on top of case