Hi ATK-SK,
I have B450 TOMAHAWK MAX and only could work with 7 GPUs, if I try to plug 8th then motherboard goes into a state that does not boot, main led stays in white (not red) and error led shows only CPU. And it need rebooting of BIOS to go back to normal state.
Could you please share your screet with us ?
Best Regards,
Bora