Nope, if you use the second 16x slot the first only gets 8 lanes due to bifurcation, so no GPU SSD. If on the other hand we got 4x pcie5 GPUs this would make sense. Sadly there are no PCIe gen 5 GPUs yet, so they all use more gen 4 lanes.
It doesn’t give you an extra, unless you have an itx board as it just takes the 8 lanes from the second 16x slot and feeds 4x of them to the SSD.
I wish there was an option for more gen4 instead. New thread ripper has gone away from the all gen5 philosophy, providing 88 lanes only 48 of which are gen5.
As someone with 8gb ram in my m1, I kinda regret it now. When it starts paging it gets bad
Already a thing if you ignore that price thing