I need help deciding how to build a good itx gaming pc, I have an cool master mid tower that I would like to build possibly an Intel cpu 8th gen.
Motherboard, gpu, ram, ect.
@OP - what case do you have? The strong argument to be made for mATX (since your case allows that size) is that you get 4 RAM slots. Always nice to be able to double RAM a few years from now without having to toss your existing stuff.
Find a link to your exact case and post it here. You clearly don't have any idea what you're doing as you keep mixing atx and itx.
If you're having that much confusion over what sized motherboard it concerns me about the rest of your build as well. Please list your budget, any parts you have already purchased, and do you need a monitor/peripherals in that budget