So I have decided that replacing my OEM non-stock CPU cooler with an aftermarket CPU fan and heatsink combination is not worth it for my 8700. I am deciding whether or not replacing the CPU fan, rear case fan, and adding a 120mm top case fan wood be better enough to justify the cost. The cost for the two fans plus the 120 mm top case fan that I already have is $22. Are noctua fans a big enough upgrade over a OEM barely above stock fan that it would noticeably cool a CPU better without replacing the heatsink along with it.