I already mining and want to add a second gpu for mining on my mobo. I bought a big PSU so it's all good. First slot(pci-e x16) is occupied with my current gpu and the second pci-e 3.0 slot works at 4x only and from the info I gathered it seems that it doesnt matter if it's not 16x, for mining is ok. I want to use a pci extender cable but the cable is pci-e 3.0 x16 cable, will the cable still work if its x16 and my slot is x4 ? I would say it work but want to be sure before I buy it https://www.thermaltake.com/gaming-pci-e-3-0-x16-riser-cable.html