Old CPU Upgrade

[driftz240]

So my parents have this old inspiron from quite literally almost a decade ago with an old celeron g470 for work at their family business. From the Hardware specs i could gather this seems to be it: https://www.cnet.com/products/dell-inspiron-660s-slim-tower-celeron-g470-2-ghz-4-gb-500-gb-us/. And recently was looking into upgrading but was put off by the cost of a new machine that their IT guy quoted them. Anyways their current pc is, obviously, very slow and affects their work flow quite often because of this, so I thought a basic cpu, ram, ssd upgrade on the cheap might be enough. As far as the CPU though i just wanted to get the thumbs up from others on here and see if something like a I5 2405s would be compatible with whatever motherboard dell has in it, it seems to be compatible as far as I know because I looked up the list of cpus that would work with that b75 chipset. The thing that would concern me though is if there were to be a bios update required for this to work or anything of that sort and possibly the higher tdp but I dont think that should be a big issue. Thanks in advance for any input.