Hi guys,

I'm familiar with air-cooling and have previously put together my own systems.
After a few years (seven....) I'm looking to upgrade my PC, but am not up to speed anymore.
I'd like to install a Thermaltake P1 case (https://www.thermaltake.com/products...?id=C_00003030), wall mounted, with water cooling. The idea is that just the CPU will be cooled, as the graphics card doesn't need cooling in normal operation (i.e. just using Win10 - fans then switch on for gaming). I could very probably do without water cooling, but want to simply try it out.
To cut a long story short, I'm not sure what motherboard to choose, due to different connectors for the pump - either a 4-pin one or an AIO one.

https://www.asus.com/Motherboards/RO...pecifications/
https://www.asrock.com/MB/Intel/Z390...#Specification

What is the difference between these connectors? What do I need to cool my CPU? The CPU may end up being one of the new i9s.

Thanks in advance for any replies!

P.S. given water cooling, pump, etc - is this a problem when transporting the PC, if for example I turn it horizontal? I.e. leaking liquid?