The best processor is one you have installed in your computer. Its a solid CPU and your son isnt being short changed by it in any way.I can’t find the 5 in stock at a reasonable price but the 7 is only £170 at Currys
https://www.currys.co.uk/gbuk/compu...49577e2418b33a83bc16acc19faa728a919425c6883d0