Question M.2 4x to 4x PCIE 1x splitter?

[MeeLee]

Hi,
I am looking at the Asrock Mini-STX motherboard,
It has an M.2 slot (direct PCIE 4x from the CPU).
I wanted it to power 4x Nvidia RTX 2060 GPUs in a small case.
My question is, if there exists a 4x version of the splitter down, that would allow a full PCIE 3.0 1x throughput for each card?
https://www.amazon.com/Ubit-Splitter-Adapter-Rabbet-Extender/dp/B07D9CN9MR

I know the 1x splitter above, further divides PCIE 3.0 1x speeds into 4, which means each card would get about 250MB/s bandwidth, which is way too slow for my purposes.

I need to find a way to get each card have access to higher than 375MB/s PCIE bandwidth.

 

[TJ Hooker]

Why not just get a bigger board that has 4 or more PCIe x1 slots? I'm assuming you're not actually going to be using a mini-STX/ITX case if you're planning on running 4+ add in cards via risers anyway.

 

[MeeLee]

Because the pc in use is a Gigabyte Brix, and only has a single m.2 slot available.
It needs to power 4GPUs, that will fit in a housing.
But I've scrapped the project, as the Brix uses 19V as a power supply, and the GPUs use 12V.
This forced me to use 2 PSUs, and there are issues with PSU ground (voltage from the PC goes to the risers, or voltage from the risers goes back to the PC, causing a throttling effect of the GPUs, and the GPUs being unstable.