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Nice one. I've done this twice over the years.
My PC is circa ten years old, possibly older and originally had an Intel Core i3-3240 . It was getting a little creaky and I had added as much RAM as the Motherboard could handle so in December 2020 I found a 2nd hand Intel Core i5-3330 online for I think £35. It had a 12 month guarantee so I took a chance and four years later it is still working.
However with the onset of time this too was getting a bit creaky so I saw an Intel Core i7-3770 on the CEX website. Again it is 2nd hand but for £27-95 incl postage it was worth a shot.
Fitted in in minutes and again the PC is lovely and smooth again.
Just upgraded my CPU on my gaming pc from an AMD 3600 to the 5700x3D. Going to squeeze out as much time out of my Am4 motherboard as I can before I need to upgrade. Haven't had a chance to run any games yet (downloading the new Indiana Jones game on Games pass at the moment). However it's noticeably zippier just in windows, opening up utilities etc what I wasn't really expecting. Got it for about £170 in the Black Friday sale so I think it's a bit of a bargain.
I've not actually swapped out a CPU for a long time so was pleasantly surprised how easy it was to just whip one out and drop the new one in. The cooler was a little trickier!