LSI 9205-8i or LSI 9207-8i for a PCIE 3.0x4 slot

Hi, I have a motherboard with a open PCIE x16 running at PCIe 3.0 x4 speed. I'm not sure what if I should get the LSI 9205-8i or the LSI 9207-8i controller. The LSI 9205-8i runs at PCIe 2.0 x8 and the LSI 9207-8i x8. Both have the x8 slot. I would like to get the 9207-8i to be future proof but I'm not sure if I would have a better chance of the 9205-8i working. Any advice would be greatly appreciated. Thanks! David

I also recommend the 9207-8i - bought mine for only € 109.- A very good price for an 8-port controller and fully compatible with unraid 😉 But be carefull: In a normal PC-Case this controller needs active cooling because its designed for a server-case with strong airflow. The minimum airflow must be 200lfm (max. operating Temp 55° / Power consumption ~9,8W). I am using this 3D-printed braket for the Noctua NF-A4x10 FLX from ShapeWays: https://www.shapeways.com/prod