Hardware Canucks posted this tweet:
They tested a bunch of X570s and found the 5700 Series GPUs wouldnt work properly with riser/vertical mounts and also they said there was no bios option to switch to Gen3. Not sure which ones they tested, they didnt say.
However, I found someone on Reddit who has a Gigabyte X570 I Aorus Pro WiFi and he said that his bios DOES have the option to switch from PCIe "Auto" to "Gen3"
They tested a bunch of X570s and found the 5700 Series GPUs wouldnt work properly with riser/vertical mounts and also they said there was no bios option to switch to Gen3. Not sure which ones they tested, they didnt say.
However, I found someone on Reddit who has a Gigabyte X570 I Aorus Pro WiFi and he said that his bios DOES have the option to switch from PCIe "Auto" to "Gen3"