Up dated to Mojave using Intel graphics on MB. Trouble-free upgrade and first time sound has worked since early High Sierra (used Multibeast 10.4.0 ).
Finally ditched Nvidia. Made sure Nvidia Web Drivers were not enabled in config.plist. Installed RX580 Pulse and it just worked. Changed...
Only Samsung 800 SSD connected (containing Sierra from old build)
Prepared Sierra usb as per instructions
Boot from usb to languge prefs ok
Start disc utility and grinds away and finds no discs
I don't suppose you need anyone to test the method with an ATI 5770?
I have built several Hackintoshs and am aware that it is unlikely that this card can be used but I was given it and it's quite good.