lg lindstrom

So,, seems like I have alot of problems. - Heating,,, - Motherboard ASUS have a controllerboard which claims that it can split x16 to "x4,x4,x4,x4". When I checked with the shop they claimed that I could use their controller with all motherboard as long it had PCI-e x16. Their board was quite expensive and when I found this board, link above, I purchased it. But you guys claims that the motherboard must support the split whatever controller board you have ?

I have a spare motherboard with gen 4 intel I7 CPU on it. I decided to replace my NAS and lot of RPI3 with this hardware. Also, I wanted to upgrade my storage volume. So I purchased 4 4T nvme memories and this controller card https://www.amazon.se/gp/product/B09NB9XJ2B/ref=ask_ql_qh_dp_hza According to instruction it supports PCIE split. My problem is that unraid only sees one nvme card. Do I miss some driver or what else can be the problem?