More than 2 GPU MSI MAG B550 Tomahawk

Anyone got more than 2 GPU to run on this motherboard?

Latest BIOS, enabled 4G crypto in BIOS and have set PCIe to gen1.

Two GPUs (3070) in PCIe 16-slots works fine (even without enabling 4G). With 4G I was able to use one 3070 in PCIe slot and the other in a riser, but only when connected to the other PCIe 16. Adding one more GPU with a riser or not connecting a GPU to PCIe slot but only use risers and it’s not booting.

Am I missing something or the motherboard won’t work with risers/more than 2 GPUs? The risers are ver009s.

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