Thanks for the reply. I'll be building this almost from scratch with the current thinking as follows;
Power supply - 650W (I already have this) - may need more depending on the final config
CPU - most likely an AMD Ryzen 7 3700X
M'board - not sure - not looking for top end or lights or armour...
I'm about to update my PC that is used for photography /rendering work - but not gaming. I want to move to 3 x Dell U3219Q 4K monitors side by side and new graphics card to replace a similar set up of 3 Dell U2711 monitors running on an ATI Radeon HD 5770 graphics card.
Software I use is...