Old CPU Upgrade

Hi all, In nearly all youtube videos out there, I found info that it is not worth buying an old i7 like 4790. But all those people do not take into account that some people, like myself, already have 4th gen motherboard so if someone has i3 or i5, buying and installing the best i7 is far cheaper...

Hello, I'm using this desktop Cores 2 Threads 2 Name Intel Core 2 Duo E7500 Package Socket 775 LGA Technology 45nm Specification Intel Core2 Duo CPU E7500 @ 2.93GHz Motherboard Manufacturer ASUSTeK Computer INC. Model P5KPL-AM/PS (Socket 775) Version x.0x Chipset...

hey guys, just wondering if these parts work together. https://www.overclockers.co.uk/asus-prime-z270-a-intel-core-i5-7600k-cpu-and-motherboard-bundle-15-pounds-saving-bu-05g-as.html# http://www.ebuyer.com/736867-crucial-8gb-ddr4-2400-udimm-ct8g4dfd824a...