I got my hands on an old PC heat sink, intel 775 I think.
Will this fit on my i5-8400 8th gen?
And if it does, what side does it go on?
The copper core is indented on one side and sticks out the other
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It isn't going to fit.
The distance between the screw-holes for the heatsink of an LGA 775 is 72 mm. Such heatsinks are not interchangeable with heatsinks for sockets that have a distance of 75 mm, such as the i5-8400 which uses the LGA 1151 socket.