Question m.2 to 4x PCIE 16x riser?

ProDigit10

Distinguished
Nov 19, 2010
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18,980
Hi guys,
The market is full with PCIE 1x slot to 4x PCIE 16x converters, for mining.
For folding, the preferred minimum is a PCIE 3.0 1x slot per card.
Using a PCIE 1x slot to 4x slots of PCIE 16x ,would slow down each card considerably, and is not recommended.

My motherboard has 1x PCIE 16x slot, and 1x M.2 slot.

Both for PCIE 16x and M.2 slot, I'm left without good options for expansion.

There are plenty of M.2 adapters that connect m.2 slots to PCIE 4x, but no converters that use the full PCIE 4x and split it up to 4x PCIE 1x USB ports(for full size slot risers).

Or simpler:
I am looking for an M.2 to 4x full size PCIE risers conversion set.

Where can I find them?