Ram.....you will need 2x4GB @ 2666......think dual channel.
OS.....you will need a copy of w10 and a key.
Hi currently I have a i3 3240, I want to upgrade so i need to change the mother board, I bought a i5 8400 and the motherboard i want is :
MSI - H310M PRO-VH Micro ATX LGA1151 Motherboard
Do i need to upgrade to windows 10? i currently have 8.1
and What ram is compatable I know its DDR4 But im not sure which ones I want 8gb 1 stick help plz

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