I have this motherboard - a big downside is many of the PCIE slots will overhang into the RAM if used for a GPU. I can't use two channels in my current ML machi

I have this motherboard - a big downside is many of the PCIE slots will overhang into the RAM if used for a GPU. I can't use two channels in my current ML machine because of this, and I have single slot 4090s.