Ans: While you can install your Nvidia GeForce GTX 1660 Ti GPU in any full size PCIe slot of your computer’s motherboard, it is recommended to use the top most slot. This is due to the reason that all motherboards have a PCIe 3.0 x16 slot or faster at the top most location. And if you want the best performance out of your graphics card, it is highly recommended to use this slot.