The Inspiron 3647 Specs say it supports 4th Gen Intel CPUs which use the LGA 1150 socket and the Intel H81 PCH chipset. 9th Gen Intel CPUs use the LGA 1151 socket and the Intel 300 Series chipset.  So there's no way a 9th Gen CPU will work in the Inspiron 3647. The best you might do is upgrade to a 4th Gen i7 CPU and maybe upgrade to the max of 16 GB of RAM, if you don't already have those. But is it worth spending money on this old PC?
I have recently acquired a 2014 Dell Inspiron 3647 as a streaming/miscellaneous PC and was wondering about upgrades. I am new to the PC and don't understand the limits of the components. I've read a few other posts and was wondering why I couldn't upgrade the power supply and throw a GTX 1050ti (low profile) in the system? Naturally, I'll be upgrading the RAM and CPU but I was also hoping one could explain why I couldn't put an i7-9th gen on the computer. Sorry, I'm clueless.
Streaming PC Upgrades for the Dell Inspiron 3647?