here are some things to think about before you go spending money.
installing windows 7 on b560 is a very hit and miss affair. i had to install the belkin usb to get usb to work during installation.
you stand a good chance by using ps/2 keyboard and rodent and an internal sata dvd drive. if you dont have those it is going to cost money to get them, and blank dvd's if you dont have any. in GB £'s thats gonna cost around £55. thats on top of buying a b560 board and cpu.
in my test 1 driver wasnt listed as where it should be on a b356 board. i dont know the full driver situation yet. i dont know how stable w7/b560etc would be in the long term but i know that windows 7 on intel 8/9th generation is fully working with all availible drivers and is rock solid stable.
if money is no object go for b560, cpu, ps2 kb rodent and internal sata drive and i hope it works.
if money is tight then dont mess around, get a new b365 board for your i5-8400, good ballistix 2666 ram and an nvme drive and you will have a capable system that is fast and stable. that is what i would do if funds are tight.
funds are tight or you wouldnt be looking at a used motherboard
8/9th gen and you wont be sorry
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