I’d be wary of spending money on an older laptop, eventually the motherboards tend to fail and then it’s junk. However, you should be able to reuse the SSD if you buy one [though you will have to reinstall Windows if you do that].
I can’t find an “i3 2400 4mb” to compare for you, but if it’s an i3, dual core, then any modern i3 or i5 will be slightly to significantly faster, and if the est of the system is newer [or sports an SSD] you’ll probably feel the difference.
[video]https://youtu.be/hNardk5hg0k[/video]
Good luck.