XPS 8950, using SATA 3 port for SSDHDD four drives

Ideally you want your drives to be plugged into the fastest sata channels available, so if the motherboard has designated sata slots at

You would probably need to use the PCIe slot if you have one free, but I simply don't know if the bus is fast enough

sata slot The PEXMSATA343 3-Port PCI Express SATA Card with HyperDuo adds an internal mSATA SSD slot plus three internal SATA III ports to

sata 3 slot 8 port Non-RAID SATA III 6Gbps to B+M Key Adapter PCI-e 2 slot also have to have Sata support? or will it just worK? I can't