Only RAM channel A works, also missing pins in USB3 header.
[FOR PARTS] MSI MAG Z690 TOMAHAWK WiFi DDR4 LGA 1700 ATX Intel Motherboard
**READ**MSI MAG Z690 TOMAHAWK WiFi DDR4 LGA 1700 ATX Intel Motherboard USB-C
MSI MAG Z690 TOMAHAWK WiFi DDR4 LGA 1700 Intel Motherboard
MSI MAG Z790 TOMAHAWK WiFi DDR4 LGA 1700 ATX Intel Motherboard (Please Read)