this is a joke -
https://download.msi.com/archive/mnu_exe/mb/M7C39v1.0.pdf
i hate the bios instructions on that manual, 2 pages????
its the fault of the makers,. on non overclocking boards they just don't tell you anything. In overclocking boards they tell you what every function does, so why do they skimp out on the others. Its like they think only overlockers need to know what things do in there...
sorry, its just... i don't know what their models are these days for overclocking boards. What CPU do you have?
in the first stage of windows install it runs off the usb until it copies itself onto the selected drive and on restart, it should be running off the ssd. But after the restart it should boot off the ssd.
is the new drive an nvme as they may not show in the boot order screen.