I suggest you ask Giga support, they have a rather epic help service on which sticks to pick for a 32GB setup.
I've seen a few people say these worked without much of a hitch but I will include a process that makes it a little less of a headache.
Crucial Ballistix Sport LT 3200 MHz DDR4 DRAM Desktop Gaming Memory Kit 32GB (16GBx2) CL16 BLS2K16G4D32AESB
Trident Z 3200MHz32GB (4x8GB)
F4-3200C16Q-32GTZSW CL16
B450 AORUS PRO WIFI (rev. 1.0)
Run and do all your installing under 1 Stick of RAM which includes the latest drivers and the EC FW tool
Use the EC FW tool to update your Bios.
Reboot to make sure everything is initialized.
Boot to BIOS and make sure XMP is disabled then install your second stick of RAM.
Shut down and remove the BIOS battery.
Boot To BIOS and verify your reading your sticks the turn on XMP.
Begin tweaking, you could be booting into 2999mhz or 3400mhz it's pretty hit and miss but you should be stable to tweak up to 3400mhz and possible 3600mhz if you're installing 3200mhz sticks.