Glad to join the Ryzen community.
For those installing windows without PS2 mouse/keyboard, log in manufacturer's web and see if there is usb installation tool. Asrock has this patcher in the drivers section. Otherwise, there is Gigabyte Windows USB Installation Tool which just adds all you need to Win7 image in like 1 click:
http://download.gigabyte.us/FileList...getool_am4.zip
Should be able to work for all AM4.
Just a check with owners of this x370 k4 board :
1. Does your chassis fan rpm show irregular speed? Mine was chassis 2 fan running 11xx rpm, while the rest of chassis fans running on 16xx rpm. Fans are connected to mobo's.
2. on windows 7 device manager, under 'other devices', i have 3 x PCI Device flagged as yellow. It says "The drivers for this device are not installed. (Code 28)", update driver leads to nowhere. What cld be it?
3. Seems to hear some echoe on youtube videos, despite disable sound effects. maybe i'll try uninstall sound blaster cinema 3?
Besides, i have managed to boot up with 3200mhz, rams are Corsair vengence 2x8gb white l.e.d version 5.39, Bios is the latest 2.40. Need to have a lil patience when the pc reboots several times. well, not too happy yet, gonna do a memory test to find out if it is stable.