You need a motherboard that is has SLI (for Nvidia cards) and CrossFire(for AMD cards). A GTX 1060 and GTX 950 are not SLI compatible, you need compatible cards for SLI. For instance, 2 GTX 1060's.
You need a motherboard that is has SLI (for Nvidia cards) and CrossFire(for AMD cards). A GTX 1060 and GTX 950 are not SLI compatible, you need compatible cards for SLI. For instance, 2 GTX 1060's.