Stock cooler Heat sink from "Intel Pentium 4" on left and "Intel core i5 (4590)" on right. The old one will definitely cool better and has copper in it. So why has
Intel Core i5-8600K CPU Cooling Fan Heatsink for Socket LGA1151 Processors - New | eBay
Amazon.com: Intel CPU Cooler for LGA1150/1155/1156 OEM (Intel E97378-001) : Electronics
Planning to replace my factory cooler on i5-8600. What are the community's thoughts on Coolermaster Hyper TX3 EVO? (Thermals with stock cooler (55-60 °C while gaming). - 9GAG
What is the stock cooler that comes with the Intel Core i3 processor? - Quora