What is Reddit's opinion of JIUWU PCI-e Express 1X to 3 Port 1X Switch Multiplier HUB Riser Card + USB Cable?

From 3.5 billion Reddit comments

Cost saving approach...I have had good luck taking old motherboards I had lying around and adding PCI slots to them with a PCIe switch from amazon (https://www.amazon.com/JIUWU-Express-Switch-Multiplier-Cable/dp/B01I2Y84TE/ref=sr_1_1?ie=UTF8&qid=1490299075&sr=8-1&keywords=JIUWU+PCI-e+Express+1X+to+3+Port+1X+Switch+Multiplier+HUB+Riser+Card+%2B+USB+Cable).

I took an old motherboar and CPU with 4 PCIe and resurrected it to a 6 PCIe board for $38 (cheaper if you wait for china mail).

I should note that I tried to use this to get 8GPU's running on a Asrock h81 BTC card, and I could only get to 7... but getting 6 going on an old asus card was a breeze.

YMMV but for $38 bucks you can maybe re-use an old board you have lying around. Haven't tried using 2 of them yet but I have some old boards with only 2 PCIe and I want to try.

There are different options:

This one will give you more PCIe ports.

JIUWU PCI-e Express 1X to 3 Port 1X Switch Multiplier HUB Riser Card + USB Cable https://www.amazon.com/dp/B01I2Y84TE/ref=cm_sw_r_cp_api_glt_fabc_EJHKJGJ0AGHBNTASRNBH

But you can also plug an expansion card that gives you more USB3.0 ports and then plug the risers you found via USB.

FebSmart 4 Ports USB 3.0 Super Fast 5Gbps PCI Express(PCIe) Expansion Card for Windows Server, XP,7,Vista,8,8.1,10 PCs-Build in Self-Powered Technology-No Need Additional Power Supply(FS-U4-Pro) https://www.amazon.com/dp/B072LS4JH7/ref=cm_sw_r_cp_api_glt_fabc_RQ95T2TF10G0SXMRY9Q8

No, there is no guarantee even one 4 way splitter will work on every motherboard. Here are some examples of it not working:

https://www.amazon.com/JIUWU-Express-Switch-Multiplier-Cable/dp/B01I2Y84TE/ref=sr_1_5?s=electronics&ie=UTF8&qid=1518571954&sr=1-5&keywords=PCI-E+multiplier

https://www.reddit.com/r/gpumining/comments/7mglej/pcie_multiplier_for_add_more_gpu_not_recognised/

https://www.reddit.com/r/EtherMining/comments/4wnqaz/anyone_have_any_luck_with_pcie_multiplier_cards/

Again, for the third time now, the motherboard must have sufficient address space available. And if you knew that, then you would have simply agreed with my comment. Seems you did not know that. It also seems you still don't know that, based on "but seriously, throwing a few 4 way splitters will work". If you'd like to educate yourself, here's some good reading:

https://electronics.stackexchange.com/questions/188742/address-spaces-in-pcie

Btw, this issue is why "Above 4G decoding" and "3.5G TOLUD" options are a thing, you may have heard those terms thrown around before.